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Equivalent Ratios: Definition & Examples

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  • 0:01 Ratios
  • 0:58 What Are Equivalent Ratios?
  • 2:27 What Are Equivalent Fractions?
  • 3:17 Example
  • 4:00 Lesson Summary
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Lesson Transcript
Instructor: Joseph Vigil
In this lesson, you'll learn what ratios are and discover their relationship with fractions. You'll also learn what makes ratios equivalent and look at some examples.

Ratios

A ratio is a relationship between two numbers (usually involving some kind of measurement). For example, when people drive, they travel at a certain speed. We usually refer to that speed as miles per hour. That's a ratio because it's a relationship between distance and time.

So if you're driving 60 mph, that means that for each hour you drive, you're traveling 60 miles.

There are all kinds of ratios. On a map, there's usually a map scale that might indicate, for instance, that 1 inch = 100 miles. Each inch on the map represents 100 miles in the real world. This is another relationship between two numbers, which makes it another ratio.

Ratios are often written in one of two ways. Let's use our map scale. One way of writing out that ratio is:

1:100

We could also write the ratio as a fraction:

1/100

What are Equivalent Ratios?

So if you're driving 60 mph (60:1 or 60/1), then in 2 hours, you'll have driven 120 miles. If we wrote out that ratio, it would be 120:2 or 120/2.

60/1 and 120/2 look different. They definitely include different numbers. But they're really the same ratio written different ways. In fact, they're called equivalent ratios, which are ratios that express the same relationship between two numbers.

The ratios 60/1 and 120/2 are equivalent because the relationship between the two parts of the ratios didn't change. According to the ratio 60/1, you travel 60 miles for every hour you drive. That relationship between the two numbers stays the same when we write 120/2. Your still driving 60 miles for every hour you drive. But since you've driven 2 hours now, you've traveled 120 miles. So even though the numbers in 120/2 are different, they still describe the same relationship between distance and time that 60/1 does.

In the same way, 180/3 is also equivalent to 60/1, because you're still traveling 60 miles every hour. The only difference is that you've driven for 3 hours now, so you've traveled a total of 180 miles.

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