Proportions – If two ratios are equal, then they are said to be in proportion. Symbol or is used to equate the two ratios.

Example: Ratios 2:3 and 6:9 is proportional.
\;2:3{\rm{ }}::{\rm{ }}6:9{\rm{ or }}2:3{\rm{ }} = {\rm{ }}6:9

The Lowest form of the Ratio If except one there is no common factor of numerator and denominator then it is the lowest form of the ratio.

Example – Find lowest form of the ratio 10: 100.

Solution: The common factor of 10 and 100 is 10, so divide both the numerator and denominator with 10. Hence the lowest ratio of 10: 100 is 1: 10

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