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