Question

3:78::5:?reasoning question salve

Answer 1

Hey there!

This is surely a question to do some thinking and is very interesting to solve. Let's solve this.

So , We are given 3 : 78 :: 5 : ?

Here , We must try to bring a relationship between 3 & 78 and apply for 5 .

So, We see that 78 is a multiple of 3 .

78/3 = 26 .

Thus, The relationship is multiplying the number by 26 .

Further applying it to 5 ,

5 * 26 = 130 .

So , The Complete answer is 3 : 78 :: 5 : 130 .

Hence, The number which replaces " ? " is 130 .

This question is of the topic " Number analogy "

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Hope you are helped!

Answer 2

Given conditions ⇒
3 : 78 :: 5 : ?

Let the fourth term (?) be x. 

Products of the means = 78 × 5
 = 390 

Products of the Extremes = 3x

∵ Products of the means = Products of the Extremes.
∴ 390 = 3x
⇒ x = 130 


Hence, the x (or ?) is 130. 

Hence, the complete Proportion is 3 : 78 :: 5 : 130


Hope it helps.