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 a car travels 120 miles in 3 hours, what is its speed in miles per hour?

Back

40 miles per hour.

Front

If 8 slices of pizza cost $12, what is the cost of one slice?

Back

$1.50.

Front

How do you find the unit rate?

Back

Divide the total amount by the number of units.

Front

If 50 apples cost $25, what is the cost of 1 apple?

Back

$0.50.

Front

What is the relationship between the number of ice cream cones and brownies sold if there are 5 cones for every 3 brownies?

Back

The ratio of ice cream cones to brownies is 5:3.

Front

If 4 big water bottles hold 8 gallons, how much does 1 big water bottle hold?

Back

2 gallons.

Front

How do you set up a proportion to find an unknown?

Back

Set the two ratios equal to each other and solve for the unknown.

Front

If 3 big water bottles hold 6 gallons, how much does each bottle hold?

Back

2 gallons.