Question

9. Find the fourth proportion to 13,4,39​

Answer 1

Answer:

a:b = c:d or a:b :: c:d. From this, we will now define the proportionals. Let us begin by defining the fourth proportional.

Step-by-step explanation:

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Answer 2

Answer

Fourth Proportion is 12

Step-by-step explanation

Let the Fourth Proportion be x

⇒ 13 : 4 :: 39 : x

⇒ 39 × 4 = 13x                  [∵ Product of Means = Product of Extremes]

⇒ 156 = 13x

⇒ x = 156/13

⇒ x = 12