Solving 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 two ratios and set the products equal to each other.

Front

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

Back

x = 9.

Front

What is the unit rate?

Back

The unit rate is a comparison of any two units in which one of the terms is 1.

Front

If Mary saves $17.50 in 3 weeks, how much does she save per week?

Back

She saves approximately $5.83 per week.

Front

How do you find the total cost for a different number of guests if you know the cost for a certain number?

Back

Use the unit rate to find the cost per guest, then multiply by the new number of guests.

Front

If it costs $9.50 for 10 guests, what is the cost per guest?

Back

The cost per guest is $0.95.

Front

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

Back

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

Front

If Ramon travels 20 miles in 20 minutes, what is his speed in miles per hour?

Back

His speed is 60 miles per hour.

Front

How do you adjust a recipe to maintain proportions?

Back

Scale the ingredients up or down by the same factor.