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 solve for the variable.

Front

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

Back

$1.50

Front

A car travels 120 miles in 3 hours. What is its speed in miles per hour?

Back

40 miles per hour.

Front

If 50 apples cost $25, how much do 75 apples cost?

Back

$37.50

Front

What is the formula for finding the unit rate?

Back

Unit Rate = Total Amount / Number of Units.

Front

If there are 5 ice cream cones for every 3 brownies, how many cones for 24 brownies?

Back

40 ice cream cones.

Front

What does it mean to cross-multiply in proportions?

Back

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

Front

If x/4 = 3/12, what is x?

Back

x = 1.

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division.