Proportions

Front

What is a proportion?

Back

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

Front

How do you solve proportions using cross multiplication?

Back

To solve a proportion, you can cross multiply the two ratios. For example, if a/b = c/d, then a*d = b*c.

Front

If a recipe calls for 2 cups of sugar for every 5 cups of flour, what is the ratio of sugar to flour?

Back

The ratio of sugar to flour is 2:5.

Front

What is the first step to find an unknown in a proportion?

Back

Set up the proportion as a fraction and cross multiply.

Front

If 3/4 = x/16, what is the value of x?

Back

x = 12.

Front

What is the ratio of 8 to 12 in simplest form?

Back

The simplest form of the ratio 8:12 is 2:3.

Front

How do you find a missing value in a proportion?

Back

You can find a missing value by cross multiplying and then solving for the unknown.

Front

If a car travels 150 miles on 5 gallons of gas, what is the unit rate in miles per gallon?

Back

The unit rate is 30 miles per gallon.

Front

What is the relationship between ratios and proportions?

Back

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

Front

If a map has a scale of 1 inch to 10 miles, how many miles does 3 inches represent?

Back

3 inches represent 30 miles.