How to Find an Unknown in a Proportion


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question 1 of 3

Which of the following is NOT a recognized way to write a ratio?

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1. Which of the following proportions is correctly set up?


Solve the proportion for the unknown x:

25 / 15 = 125 / x

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About This Quiz & Worksheet

Use the worksheet and quiz to determine what you know about finding unknowns in proportions. Specific topics you'll need to understand include how to calculate a proportion with an unknown and how to recognize proportions which are correctly set up.

Quiz & Worksheet Goals

The quiz will test you on:

  • Solving proportions for the unknown x
  • Finding the proportion of 5/22 = 6/x
  • Calculating the ratio of butter needed in a given recipe

Skills Practiced

These study skills will be practiced:

  • Reading comprehension - ensure that you draw the most important information from the related lesson on finding unknowns in proportions
  • Problem solving - use acquired knowledge to solve proportion practice problems
  • Information recall - access the knowledge you've gained regarding recognized ways to write a ratio

Additional Learning

Use the lesson called How to Find an Unknown in a Proportion to explore this subject further. The lesson covers the following objectives:

  • Define ratio
  • Understand what a proportion is
  • Apply calculations for proportions
  • Learn how to check results of calculations