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 terms and then isolate the variable.

Front

What is cross-multiplication?

Back

Cross-multiplication is a method used to solve proportions by multiplying the numerator of one ratio by the denominator of the other ratio.

Front

If 12 ounces of shampoo lasts 16 weeks, how long will 18 ounces last?

Back

24 weeks.

Front

Solve the proportion: 2/3 = x/12. What is x?

Back

8.

Front

What is the formula for finding a missing value in a proportion?

Back

If a/b = c/d, then ad = bc.

Front

Solve for x in the proportion: 11/10 = 22/x.

Back

x = 20.

Front

If a recipe calls for 2 cups of flour for 3 servings, how much flour is needed for 9 servings?

Back

6 cups.

Front

What does it mean if two ratios are equivalent?

Back

It means that they represent the same relationship between quantities.

Front

Solve the proportion: 4/x = 8/16. What is x?

Back

x = 2.