Ratios, Rates, And Proportions Worksheet With Answers Page 4
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16Proportions
Two ratios (or two rates) in fractions set equal to each other is called a proportion.
A proportion is true if those two fractions set equal are equivalent. Otherwise, we say that the
proportion is false.
Example 5
These are proportions:
a.
b.
c.
Note that of the three proportions above, only b is true since and
are equivalent
fractions.
How do you know if a proportion is true?
A proportion of the form,
is true if
In other words, given a proportion, you can check if it is true by cross-
multiplication.
To check if
is a true proportion, cross multiply!
Is
If yes, then it is a true proportion!
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