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A ratio is the amount of one quantity compared to another quantity, or, in simpler terms, one quantity divided by another. Ratios are written with a colon (the : symbol).

When two ratios are equal, they are a proportion.

Example of a ratio

Texas is approximately 16 times the size of the Netherlands. Thus the ratio of the size of Texas to the Netherlands would be 16 to 1, written as 16:1.