Question

390 : 315 : : ____ : 564
Number analogy
I want explanation
A) 663
B)689
C) 653
D) 674
​

Answer 1

Explanation:

390:315::x:564

390/315=x/564

=>x=(390×564)/315

=>x=698.28(approximately 698)

But this answer is not in your option, so please check.

Answer 2

Answer:

Correct option is B)689

Explanation:

• Proportion: The ration of first two numbers is equal to the ratio of second two numbers.
• Suppose a proportional relation is, a : b :: c : d

       Here 'a' is the first proportion, 'b' is the second proportion, 'c' is the third proportion and 'd' is the fourth proportion.

• The given analogy is 390 : 315 : : ____ : 564

   Lets assume the third proportion is 'x'.

   The expression will be - 390 : 315 :: x : 564

                                             $\frac{390}{315} = \frac{x}{564}$

                                           315x = 390 × 564

                                              x = $\frac{390\times 564}{315}$ = 698.28

   The nearest number to 698.28 is 689.

   So, the third proportion will be 689.

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