Question

Find the fourth proportional in 5, 4 and 15

Answer 1

Answer:

Let the fourth proportion be - x

$5 : 4 : :15 : x \\ \\ = x \times 5 = 4 \times 15 \\ \\ x = \frac{4 \times 15}{5} \\ \\ x = 4 \times 3 \\ \\ x = 12$

So,

Fourth proportional number is =x= 12

Answer 2

Answer:

12

Step-by-step explanation:

let the fourth proportional be x

then

5:4:15:x

product of mean = product of extreme

so

5×x=4×15

x= 4×15/5

x=4×3

x=12

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