1

Problem

Find the fourth proportion to 4,6 and 8.

2

Step

Let us take the third proportion is

x

3

Step

We can write the above numbers in the proportional form (a :b::c :d):

4 : 6::8 : x

4

Formula

Hint: \$a/b::c/d\$.

5

Hint

Here a = 4 , b = 6 ,c = 8 & d = x.

6

Step

Let us find the x value:

x = \$ (6 \times 8)/4\$

x = 12

7

Solution

So, the fourth proportion is x = 12.

8

Sumup

Please summarize steps

Choices

9

Choice-A

21 is wrong; it doesn’t follow the proportional relationship between the terms

Wrong 21

10

Choice-B

The proportional relationship between the terms shows that 22 is incorrect

Wrong 22

11

Choice-C

23 is incorrect because it does not match the correct calculation of the fourth proportion

Wrong 23

12

Choice-D

Correct fourth proportion calculation result

Correct 12

13

Answer

Option

D

14

Sumup

Please summarize choices