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| Proportion |
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| a, b, c and d are said to be proportion if a : b = c : d. |
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| a and d are called the extremes, b and c are called the means. |
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| a, b, c and d are called first proportion, second proportion, third proportion and fourth proportion respectively. |
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| Find the fourth proportion to 27, 39, 36 |
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| Let the fourth proportion be 'x'. |
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 27 : 39 = 36 : x |
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| = 52 |
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| Ans: x = 52 |
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| If a, b, c are said to be continued proportion, then a : b = b : c |
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 b2 = a x c |
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| a is called the first proportion; b is called the mean proportion; c is called the third proportion. |
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