Proportion

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a, b, c and d are said to be proportion if a : b = c : d.

a and d are called the extremes, b and c are called the means.

a, b, c and d are called first proportion, second proportion, third proportion and fourth proportion respectively.

Find the fourth proportion to 27, 39, 36

Let the fourth proportion be 'x'.

27 : 39 = 36 : x

= 52

Ans: x = 52

Continued Proportion:

If a, b, c are said to be continued proportion, then a : b = b : c

b² = a x c

a is called the first proportion; b is called the mean proportion; c is called the third proportion.