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Proportion
A proportion is a statement that two ratios are equal.
It is an equation with a ratio on each side.
Example:  4/8 = 2/4
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What is a Ratio?
A ratio is a comparison of two numbers that can be
expressed in the following three ways:
as a Fraction
with a colon (:)
using the word “to”
Example: as a fraction: 2/4
with a colon: 2:4
with “to”: 2 to 4