Discussion :: Ratio and Proportion  General Questions (Q.No.8)
8.  If 0.75 : x :: 5 : 8, then x is equal to: 

Answer: Option B Explanation:

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). 
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