Question

fourth proportion to 7.2 , 1.8 , 8.4

Answer 1

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Let x be the Fourth Proportion

Then

$7.2 \: : 1.8 = 8.4 \: : x$

$\therefore \: x \: = \frac{(8.4 \times 1.8)}{7.2} = 2.1$

So the required answer is 2.1

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Answer 2

Answer:

Let the fourth proportion be X

7.2 : 1.8 :: 8.4 : X

| |_____| |

|_____________|

Product of extremes = product of means

7.2X = 1.8 * 8.4

x = 1.8 * 8.4

7.2

x = 2.1

Fourth proportion = 2.1

verification = 7.2 : 1.8 :: 8.4 : 2.1

7.2 * 2.1 = 1.8* 8.4

15.12 = 15.12