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# If A/B = C/D Prove that Each of the Given Ratio is Equal to Sqrt((3a^2 - 10c^2)/(3b^2 - 10d^2)) - ICSE Class 10 - Mathematics

#### Question

If a/b = c/d prove that each of the given ratio is equal to sqrt((3a^2 - 10c^2)/(3b^2 - 10d^2))

#### Solution

Let a/b = c/d = k

Then a = bk and c = dk

sqrt((3a^2 - 10c^2)/(3b^2 - 10d^2)) = sqrt((3(bk)^2 - 10(dk)^2)/(3b^2 - 10d^2)) = sqrt((k^2(3b^2 - 10d^2))/(3b^2 - 10d^2)) = k =  "each given ratio"

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#### APPEARS IN

Selina Solution for Selina ICSE Concise Mathematics for Class 10 (2018-2019) (2017 to Current)
Chapter 7: Ratio and Proportion (Including Properties and Uses)
Ex.7B | Q: 18.3

#### Video TutorialsVIEW ALL [1]

Solution If A/B = C/D Prove that Each of the Given Ratio is Equal to Sqrt((3a^2 - 10c^2)/(3b^2 - 10d^2)) Concept: Proportions.
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