Proportion Word Problems

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 unknown variable.

Front

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

Back

If a/b = c/d, then ad = bc.

Front

If a recipe calls for 2 cups of flour for every 3 cups of sugar, what is the ratio of flour to sugar?

Back

The ratio of flour to sugar is 2:3.

Front

If a car travels 60 miles in 1 hour, how far will it travel in 3 hours at the same speed?

Back

180 miles.

Front

What is the scale factor in a model?

Back

The scale factor is the ratio of a length in the model to the corresponding length in the actual object.

Front

If a model of a building is 1 ft tall and the actual building is 10 ft tall, what is the scale factor?

Back

The scale factor is 1:10.

Front

How do you convert units in a proportion?

Back

To convert units, ensure both sides of the proportion are in the same unit before solving.

Front

If 5 apples cost $2, how much do 15 apples cost?

Back

$6.

Front

What is the relationship between ratios and proportions?

Back

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