# Aptitude - Ratio and Proportion - Discussion

### Discussion :: Ratio and Proportion - General Questions (Q.No.8)

8.

If 0.75 : x :: 5 : 8, then x is equal to:

 [A]. 1.12 [B]. 1.2 [C]. 1.25 [D]. 1.3

Explanation:

 (x x 5) = (0.75 x 8)    x = 6 = 1.20 5

 Shriram said: (Sep 7, 2011) 0.75 5 ---- : --- x 8 cross multiplication x = 0.75*8/5 x = 1.2

 Felci said: (Jan 28, 2012) 0.75/x=5/8 0.75*8=5*x 6=5*x x=6/5=1.2

 Patrali said: (Feb 11, 2012) How come 6 is there?

 Karthik said: (Mar 21, 2012) 0.75*8=6

 Abhi said: (Jul 3, 2012) If a:b::c:d, Here a and d are the extremes. And b and c are the mean terms. According to the proportion rule. (product of means) = (product of extremes). So, over problem 0.75:x::5:8. Becomes, x*5 = 0.75*8. 5x = 6. X = 6/5. X = 1.2.

 Krrishree said: (Oct 27, 2014) @Patrali. We all are many minded so if you think in that way. You can understand easily and fastly. 0.75 means 50p+25p. Here 8 50p means Rs.4 and 8 25p means Rs.2 Now Rs.4+Rs.2 = Rs.6

 Abi said: (Oct 16, 2015) How 6/5 comes 1:2?

 Pawan said: (Jan 26, 2016) 60 percent of 5 = 3. So 5+3 = 8. In the same way 60 percent of 0.75 = 0.45. Then 0.75 + 0.45 = 1.20.

 Ajay said: (Oct 11, 2016) .75/X = 5/8, X = 1.2.

 M.Nusrath Beevi said: (Feb 19, 2017) How cum there is 1.20? Explain in detail.

 Jay said: (Apr 6, 2017) Why do we do x x 5 and 0.75 x 8? Why isn't it 0.75 x 5 and x x 8?

 Janu said: (Aug 10, 2017) I can't understood clearly. Please explain that.

 Paarth said: (Aug 10, 2017) 0.75 change new with no like after 0 two digit found we do like 75/100*8 = 6.

 Harika said: (Feb 26, 2018) When we see :: in between, a:b :: c:d. Formula is a*d=b*c .so, by given values we can find x, here they gave a, c, d values we need to find b, according to formula. 0.75*8=5*x. x=6/5 which is 1.2. @Janu hope you got it.

 Shariqq said: (Aug 12, 2018) The answer is 1.20. We have to do cross multiply here

 Ruchith Praharsha said: (Sep 12, 2018) The product of means equals to product of extremes, 5 * x = 0.75 * 8, 5x = 6, x=6/5, x=1.2.

 Tapash said: (Sep 26, 2018) Thanks to all for the explanation.

 Akash Kumar said: (Nov 2, 2018) 0.75 : x :: 5 : 8. 0.75/x = 5/8. 5x = 0.75 * 8, X = 0.75 * 8/5, X = 1.20.

 Durgesh Khismatrao said: (Jul 4, 2019) a/b = c/d. 0.75/x = 5/8. (0.75 * 8)/5 =x, 6/5= x. 1.2 =x.

 Rahul said: (Apr 18, 2020) 5x = 0.75*8, 5x = 6.00, x = 6.00/5, x = 1.2.

 Bhumi said: (Apr 27, 2020) Here, In the problem given that 0.75:x::5:8, So, it means 0.75:x=5:8. Here, 0.75and 8 are called extremes and at the same time, x and5are called means. For example, a:b::c:d. Then the product of extremes(a*d)=the product of mean(b*c). So that's why it came, 0.75*8=5x, 6=5x=6/5, Therefore, x = 1.2(ans).