Question

Find the fourth proportion to 5, 15 and 8
(A)40
(B) 11
(C) 10
(D) 24
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Answer 1

Answer:

answer Is 24...........

Answer 2

Given :

⬤ Proportion = 5 , 15 and 8 .

To Find :

⬤ The Fourth Proportion .

Solution :

• First Proportion = 5
• Second Proportion = 15
• Third Proportion = 8
• Fourth Proportion = ?

Let :

• The Fourth Proportion be x .

Now :

5 : 15 : 8 : x

Product of Extremes = Product of Means

Product of Extremes = 5 × x

Product of Means = 15 × 8

$\sf{5\times{x}=15\times{8}}$

15 × 8/5

3 × 8

24

Therefore , The Fourth Proportion is 24 .

Option d) is Correct .

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Extra Information :

Proportion :

Proportion is a Statement which shows that two ratios are equal . Such an equality of two ratios is called Proportion .

Like → 13 : 247 and 15 : 75

Extreme and Means of a Proportion :

Suppose , a , b , c and d are in Proportion .

The First and Fourth terms (a , d) are Called Extremes terms or Extremes . And the Second and Third terms (b , c) are called Middle Terms or Means .

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