How Do You Determine if Two Ratios are Proportional Using Cross Products?

How Do You Determine if Two Ratios are Proportional Using Cross Products?

Note:

Trying to figure out if two ratios are proportional? If they're in fraction form, set them equal to each other to test if they are proportional. Cross multiply and simplify. If you get a true statement, then the ratios are proportional! This tutorial gives you a great example!

Keywords:

  • problem
  • ratios
  • form proportion
  • proportion
  • equivalent
  • same
  • cross multiply
  • multiply
  • means extremes of proportions
  • ratio
  • proportions

Background Tutorials

  • Understand the concept of a ratio and use ratio language to describe a ratio relationship between two quantities.

      • What's a Ratio?What's a Ratio?

      What's a Ratio?

      Ratios are everywhere! The scale on a map or blueprint is a ratio. Ingredients sometimes need to be mixed using ratios such as the ratio of water to cement mix when making cement. Watch this tutorial to learn about ratios. Then think of some ratios you've encountered before!

  • Decide whether two quantities are in a proportional relationship, e.g., by testing for equivalent ratios in a table or graphing on a coordinate plane and observing whether the graph is a straight line through the origin.

      • What's a Proportion?What's a Proportion?

      What's a Proportion?

      The idea of proportions is that a ratio can be written in many ways and still be equal to the same value. That's why proportions are actually equations with equal ratios. This is a bit of a tricky definition, so make sure to watch the tutorial!

  • Use proportional relationships to solve multistep ratio and percent problems.

Further Exploration

  • Use proportional relationships to solve multistep ratio and percent problems.