Question

25:100 :: 81:? find the answer by relating the 1st one.
1)648 2)468
3)864 4)684

Answer 1

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Answer 2

Answer:  The complete proportion is $25:100::81:324.$

Step-by-step explanation:

We are given to find the value of x in the following fourth proportion :

$25:100::81:x.$

We have from the property of fourth proportion

$25:100=81:x\\\\\Rightarrow 25:100=81:x\\\\\\\Rightarrow \dfrac{25}{100}=\dfrac{81}{x}\\\\\\\Rightarrow\dfrac{1}{4}=\dfrac{81}{x}\\\\\Rightarrow x=81\times4\\\\\Rightarrow x=324.$

Thus, the complete proportion is $25:100::81:324.$