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# If A/B = C/D Prove that Each of the Given Ratio is Equal To: ((8a^3 + 15c^3)/(8b^3 + 15d^3))^(1/3) - Mathematics

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#### Question

if a/b = c/d prove that each of the given ratio is equal to: ((8a^3 + 15c^3)/(8b^3 + 15d^3))^(1/3)

#### Solution

Let a/b = c/b = k

Then a =  bk and c = dk

((8a^3 + 15c^3)/(8b^3 + 15d^3))^(1/3) =  [(8(bk)^3 + 15(dk)^3)/(8b^3 + 15d^3)]^(1/3) = [(k^3(8b^3 + 15d^3))/(8b^3 + 15d^3))]^(1/3) = k = each given ratio

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If A/B = C/D Prove that Each of the Given Ratio is Equal To: ((8a^3 + 15c^3)/(8b^3 + 15d^3))^(1/3) Concept: Concept of Proportion.