1.

The fourth proportional to 0.14, 0.21 and 13 is?1. 19.52. 22.63. 21.74. 18.8

Answer» Correct Answer - Option 1 : 19.5

Concept Used:

The concept of proportion states that

a ∶ b ∶∶  c ∶ x

Where a, b and c are the first three numbers of the proportion,

and the fourth proportion is x 

⇒ a/b = c/x 

x = (b × c)/a

Calculation:

Let the fourth proportional be  x

0.14 ∶ 0.21 ∶∶ 13 ∶ x

0.14/0.21 = 13/x

x = 13 × 0.21/0.14

x = 19.5

∴ The fourth proportional is 19.5



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