Ratio
A ratio is a comparison of numbers by division. A ratio can be written in the following ways:
- with the word to
- with a colon [:]
- as a fraction
Like a fraction, a ratio should be reduced to lowest terms.
In order to solve a ratio problem, you may have to calculate one of the numbers in a ratio.
In one neighborhood, 7 homeowners have snow-blowers and 28 home owners use shovels. What is the ratio of snow-blowers to shovels?
A) 1:4
B) 7:4
C) 1:28
D) 4:1
E) 28:7
Of the 359 workers at a company, 62 are office workers. What is the approximate ratio of office workers to non-office workers?
A) 1:5
B) 1:6
C) 5:6
D) 60:360
E) 62:359
Proportion
A proportion is a statement that two ratios are equal.
Each of the four numbers in a proportion is called an element, or a term.
The cross products in a proportion are equal.
To solve a proportion, follow these steps:
Write a statement with two equal cross products.
Divide both sides of the statement by the number in front of the missing term.
What is the missing term in the proportion?
9/x = 15/10
A) 90
B) 13.5
C) 10
D) 6
E) 4
A clerical assistant earns $45.20 in 8 hours. At this rate, how much does he earn in 40 hours?
A) $180.00
B) $226.00
C) $361.60
D) $404.00
E) $1,808.00
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