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

What does it mean for two ratios to be proportional?

Back

Two ratios are proportional if they can be expressed as equivalent fractions.

Front

If 5/10 = x/20, what is the value of x?

Back

x = 10.

Front

What is the cross-multiplication method?

Back

The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio.

Front

If a car travels 150 miles on 5 gallons of gas, how far can it travel on 8 gallons?

Back

240 miles.

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities when they are combined together.

Front

How do you determine if a graph represents a proportional relationship?

Back

A graph represents a proportional relationship if it passes through the origin (0,0) and is a straight line.

Front

What is the formula for finding a missing value in a proportion?

Back

The formula is a/b = c/d, where a, b, c, and d are the values in the proportion.

Front

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

Back

x = 12.