1.

Find 4th proportional to 3, 18 and 71. 212. 423. 354. 28

Answer» Correct Answer - Option 2 : 42

Given:

Numbers are 3, 18 and 7

Formula Used:

When a, b, c and d are in proportion, it is written as

a : b ∷ c : d

⇒ a/b = c/d

⇒ ad = bc

Calculation:

Let the fourth proportional be x

3 ∶ 18 ∶∶ 7 ∶ X

⇒ 3/18 = 7/X

⇒ X = 6 × 7 = 42

∴ Fourth proportional is 42.


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