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 then solve for the unknown.

Front

What is a ratio?

Back

A ratio is a comparison of two quantities, showing how many times one value contains or is contained within the other.

Front

If Sue types 3 pages in the same time Mary types 4.5 pages, how many pages will Mary type when Sue types 11 pages?

Back

16.5 pages

Front

If a 6-ounce package contains 45 pieces, how many pieces are in a 10-ounce package?

Back

75 pieces

Front

What is the formula to estimate a population based on a sample?

Back

Estimated population = (Number in sample / Total sample size) x Total population size.

Front

If John caught 50 fish and 14 were trout, how many trout would you expect in a lake with a population of 7,500?

Back

2,100 trout

Front

What is the relationship between part and whole in a proportion?

Back

The part is to the whole as the part is to the total quantity.

Front

If 13 out of 20 homes have a computer, how many homes would you expect on a street with 60 homes to have a computer?

Back

39 homes

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.