Question

The fourth proportion of 2, 5 and 6 is
(i) 10
(ii) 15
(iii) 20
(iv) 25

Answer 1

Step-by-step explanation:

Given:

The fourth proportion to be found for 15, 12, and 20.

Concept used:

When four numbers a, b, c, and d are in the following relation, a ∶ b = c ∶ d

Then, the fourth proportion of a, b and c is d.

Fourth proportion, d = (b × c)/a

Calculation:

Here, a = 15

b = 12

and, c = 20

Thus, fourth proportion, d = (12 × 20)/15

\Fourth proportion, d = 16

∴ The fourth proportion to 15, 12 and 20 is 16.