Question

If a,b,c,d are in proportion and a=4,b=8,c=5 then find d ​

Answer 1

SOLUTION

GIVEN

a , b , c , d are in proportion and a = 4 , b = 8 , c = 5

TO DETERMINE

The value of d

EVALUATION

Here it is given that a , b , c , d are in proportion

Thus we have

a : b = c : d

Again we have a = 4 , b = 8 , c = 5

Thus we get

4 : 8 = 5 : d

$\displaystyle\sf{ \implies \: \frac{4}{8} = \frac{5}{d} }$

$\displaystyle\sf{ \implies \: 4d = 40 }$

$\displaystyle\sf{ \implies \: d = 10 }$

FINAL ANSWER

Hence the required value of d = 10

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