1.

The fourth proportional to 3, 4 and 15 is?1). 202). 173). 184). 15

Answer»

Let x be the fourth proportional to 3,4 and 15

⇒ 3 ? 4 ?? 15 ? x

Since, PRODUCT of the EXTREMES = Product of the means

∴ 3x = 15 x 4

∴ x = 20



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