Solve Proportions 74B

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 Ernesto can make 2 flags in 3 hours, how long will it take him to make 5 flags?

Back

7.5 hours

Front

What is the formula for finding the unit rate?

Back

Unit Rate = Total Quantity / Total Time.

Front

If a car travels 420 miles in 8 hours, what is its speed in miles per hour?

Back

Speed = Distance / Time = 420 miles / 8 hours = 52.5 miles per hour.

Front

What does it mean to scale a ratio?

Back

Scaling a ratio means to multiply both terms of the ratio by the same number to find equivalent ratios.

Front

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

Back

40 ice cream cones.

Front

What is the relationship between ratios and proportions?

Back

Ratios compare two quantities, while proportions show that two ratios are equal.

Front

How do you find the missing value in a proportion?

Back

Set up the proportion, cross-multiply, and solve for the missing value.

Front

What is the cross-multiplication method?

Back

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