- Ratio, Proportion and Unitary Method.
- The comparison of two numbers or quantities by division is known as the ratio.
- Symbol ‘:’ is used to denote ratio.
- For a ratio, the two quantities must be in the same unit.
- If they are not, they should be expressed in the same unit before the ratio is taken.
- A ratio may be treated as a fraction.

**SEE ALSO : Chapter 13: Symmetry**

- Two ratios are equivalent, if the fractions corresponding to themare equivalent.
- Four quantities are said to be in proportion, if the ratio of the first and the second quantities is equal to the ratio of the third and the fourth quantities.
- The symbol ‘::’ or ‘=’ is used to equate the two ratios.
- The order of terms in a proportion is important.
- For example 3, 8, 24, 64 are in proportion but 3, 8, 64, 24 are not in proportion.
- The method in which first we find the value of one unit and then the value of the required number of units is known as unitary method.

**SEE ALSO : Chapter 11: Algebra**

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