Solving Proportions

Front

What is a proportion?

Back

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

Front

How do you determine if two ratios form a proportion?

Back

Two ratios form a proportion if the cross products are equal.

Front

Solve the proportion: 10/15 = x/45

Back

x = 30

Front

If a recipe requires 2 cups of flour for 4 servings, how much flour is needed for 10 servings?

Back

5 cups of flour.

Front

What is the ratio of boys to girls if there are 8 boys and 12 girls?

Back

The ratio is 2 to 3.

Front

Solve the proportion: 3/x = 9/12

Back

x = 4.

Front

If 5 apples cost $2, how much do 15 apples cost?

Back

$6.

Front

What is the first step in solving a proportion?

Back

Cross-multiply the ratios.

Front

If the ratio of cats to dogs is 3:4 and there are 12 cats, how many dogs are there?

Back

16 dogs.

Front

Solve the proportion: x/8 = 3/12

Back

x = 2.