Question

The fourth proportional to 5,10,25 is ?

Answer 1

Answer:

5:10::25:x

5x=10*25

x=10*25/5

x=50

Answer 2

The fourth proportional to 5 , 10 , 25 is 50

Given : The numbers are 5 , 10 , 25

To find : The fourth proportional

Solution :

Step 1 of 2 :

Assume the fourth proportional

Let x be the fourth proportional to 5 , 10 , 25

So we have

5 : 10 = 25 : x

Step 2 of 2 :

Find the value of x

5 : 10 = 25 : x

$\displaystyle \sf{ \implies \frac{5}{10} = \frac{25}{x} }$

$\displaystyle \sf{ \implies 5x = 250 }$

$\displaystyle \sf{ \implies x = 50 }$

The fourth proportional to 5 , 10 , 25 is 50

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