Solving Proportions

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the two ratios and set the products equal to each other.

Front

If 3 out of every 8 skittles are yellow, how many yellow skittles are in a bag of 16?

Back

6

Front

What does it mean if two ratios form a proportion?

Back

It means that the two ratios are equivalent, or that they represent the same relationship.

Front

Solve the proportion: 5/10 = x/20

Back

x = 10

Front

If Sarah used 9 red beads and 12 blue beads, how many blue beads would she need for 15 red beads?

Back

20

Front

What is the first step in solving a proportion?

Back

Identify the two ratios that are being compared.

Front

What is the cross-multiplication method?

Back

Cross-multiplication involves multiplying the numerator of one ratio by the denominator of the other ratio.

Front

If a ratio is 2:3, what is the equivalent ratio if both terms are multiplied by 4?

Back

8:12

Front

How can you check if two ratios form a proportion?

Back

You can check by cross-multiplying and seeing if the products are equal.