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Ratio of a to b
a comparison of two numbers using divison. The ratio of a to b, where b doesnt equal 0, can be written as a to b or a:b or a/b
proportion
An equation that states that two ratios are equal.
Means
the middle two numbers in a proportion
Extremes
the first and last numbers in a proportion
Cross Products Property
in a proportion, the product of the extremes equals the product of the means
geometric mean
the square root of the product of the extremes or means
