# Ch 4: WEST Math: Ratios & Proportions

### About This Chapter

## WEST Math: Ratios & Proportions - Chapter Summary

While you may have a good fundamental understanding of ratios and proportions, it's wise to review these topics for the WEST Math exam. Through a series of short video lessons, this chapter explores quite a few of the most common problems involving ratios and proportions, including:

- Calculating average and constant rates
- Solving problems with percents
- Understanding proportions in mathematics
- Using scale factors to solve math problems

Our fun and engaging video lessons are chock-full of ratio-and-proportion problems with step-by-step solutions, allowing you to see exactly how to approach these kinds of problems on the WEST Math exam. Take the short quiz at the end of each lesson, and reach out to our expert math instructors any time you need additional help.

### Objectives of the WEST Math: Ratios & Proportions Chapter

The WEST Math exam is a computer-based test that includes 150 multiple-choice questions. New and current Washington State teachers are required to pass this test if they want to qualify for a math teaching endorsement. The Study.com video lessons included in this chapter can help you answer many of the ratio- or proportion-related questions on the WEST Math exam. These questions are part of the mathematical processes and number sense sub-area, which makes up about 19% of the test.

Registration for the WEST Math exam is offered year-round at Pearson testing centers in your area. You can register online and check seat availability for any test date. On the day of the test, you'll be provided with a calculator and a page of formulas. You'll have 4 hours and 15 minutes to answer all 150 questions on the exam, and upon completion, you'll receive your score. The minimum passing score is 220. You can re-take the test if you don't pass, but you'll need to wait at least 30 days.

### 1. Ratios & Rates: Definitions & Examples

If we have two items, or two numbers, and we want to compare them, what language can we use? How do we write the comparison? Find out as we learn about ratios and rates in this lesson.

### 2. Finding Constant and Average Rates

Watch this video lesson to learn the differences between constant and average rates. You will learn the steps you need to take to find them and get two great visuals you can keep in mind to help you solve these rate problems.

### 3. Proportion: Definition, Application & Examples

When we want to compare one ratio, or fraction, to another equivalent ratio, it's a proportion. Learn all about proportions and practice solving proportion problems in this lesson.

### 4. Calculations with Ratios and Proportions

Even if only 99 out of 100 people need to know how to work with ratios, the odds that they'll be useful to you are very high. In this lesson, we'll practice performing calculations with ratios and proportions.

### 5. Applying Scale Factors to Perimeter, Area, and Volume of Similar Figures

How do shapes change sizes yet retain their proportions and similarities to other shapes? In this lesson, we'll look at what a scale factor is and how to apply it. We'll consider scale factors with regards to three different aspects of similar shapes: perimeter, area and volume.

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### Other Chapters

Other chapters within the NES Mathematics - WEST (304): Practice & Study Guide course

- WEST Math: Properties of Real Numbers
- WEST Math: Fractions
- WEST Math: Decimals & Percents
- WEST Math: Units of Measure & Conversions
- WEST Math: Logic
- WEST Math: Reasoning
- WEST Math: Vector Operations
- WEST Math: Matrix Operations & Determinants
- WEST Math: Exponents & Exponential Expressions
- WEST Math: Algebraic Expressions
- WEST Math: Linear Equations
- WEST Math: Inequalities
- WEST Math: Absolute Value
- WEST Math: Quadratic Equations
- WEST Math: Polynomials
- WEST Math: Rational Expressions
- WEST Math: Radical Expressions
- WEST Math: Systems of Equations
- WEST Math: Complex Numbers
- WEST Math: Functions
- WEST Math: Piecewise Functions
- WEST Math: Exponential & Logarithmic Functions
- WEST Math: Continuity of a Function
- WEST Math: Limits
- WEST Math: Rate of Change
- WEST Math: Derivative Rules
- WEST Math: Graphing Derivatives
- WEST Math: Applications of Derivatives
- WEST Math: Area Under the Curve & Integrals
- WEST Math: Integration Techniques
- WEST Math: Applications of Integration
- WEST Math: Foundations of Geometry
- WEST Math: Geometric Figures
- WEST Math: Properties of Triangles
- WEST Math: Triangle Theorems & Proofs
- WEST Math: Parallel Lines & Polygons
- WEST Math: Quadrilaterals
- WEST Math: Circles & Arc of a Circle
- WEST Math: Conic Sections
- WEST Math: Geometric Solids
- WEST Math: Analytical Geometry
- WEST Math: Trigonometric Functions
- WEST Math: Trigonometric Graphs
- WEST Math: Solving Trigonometric Equations
- WEST Math: Trigonometric Identities
- WEST Math: Sequences & Series
- WEST Math: Set Theory
- WEST Math: Statistics Overview
- WEST Math: Summarizing Data
- WEST Math: Tables, Plots & Graphs
- WEST Math: Probability
- WEST Math: Discrete Probability Distributions
- WEST Math: Continuous Probability Distributions
- WEST Math: Sampling
- NES Mathematics WEST Flashcards