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**Comparison by difference**

**Comparison by division**

**RATIO: The ratio of two quantities of the same kind and in the units is a fraction that shows how many times the one quantity is of the other.**

**RATIO IN THE SIMPLEST FORM: A ratio `a : b` is said to be in the simplest form if its antecedent a and consequent b have no common factor other than 1.**

**Equivalent ratios**

**PROPORTION: An equality of two ratios is called a proportion.**

**CONTINUED PROPORTION: Three numbers `a, b ,c` are said to be in continued proportion if `a ,b ,b ,c` are in proportion.**

**MEAN PROPORTIONAL: If `a b c` are in continued proportion then b is called the mean proportional between `a and c`.**