Question

first, second and third terms of a proportion are respectively 80, 64 and 30. find its fourth term

Answer 1

Let The fourth Term be x

so,

80:64: :30:x

Product of mean = Product Of Extreme

$64*30=80*x\\\frac{64*30}{80} = x\\\frac{16*3}{1} = x\\ 16*3 = x\\48 = x$

Therefore, Fourth Term = 48

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