Aptitude - Ratio and Proportion - Discussion
Discussion Forum : Ratio and Proportion - General Questions (Q.No. 13)
13.
The fourth proportional to 5, 8, 15 is:
Answer: Option
Explanation:
Let the fourth proportional to 5, 8, 15 be x.
Then, 5 : 8 : 15 : x
5x = (8 x 15)
| x = | (8 x 15) | = 24. |
| 5 |
Discussion:
34 comments Page 2 of 4.
Manish said:
6 years ago
Product of means = product of extremes.
(1)
Ajay Bhagat said:
6 years ago
5:8 = 15:x.
5/8 = 15/x.
5x = 15 * 8.
x = 90/5,
x =18.
5/8 = 15/x.
5x = 15 * 8.
x = 90/5,
x =18.
(2)
Sk.Rahul Basha said:
7 years ago
4th proportion formula.
d = bc/a.
Here. a=5,b=8,c=15,
Now submit in formula.
d=8*15/5=24.
d = bc/a.
Here. a=5,b=8,c=15,
Now submit in formula.
d=8*15/5=24.
(1)
Jay said:
9 years ago
How to find fifth proportional?
Eg: Find the fifth proportional to 15, 18, 33, 51?
Eg: Find the fifth proportional to 15, 18, 33, 51?
(3)
Riba said:
9 years ago
@Kirshna.
The answer is 32.
8/15 = x/60.
The answer is 32.
8/15 = x/60.
Kirshna said:
9 years ago
If 60 is the fourth proportional to 8, 15 and x ; find x.
Please solve this.
Please solve this.
Akshay said:
9 years ago
@All.
There is no any formula they just use a simple logic of a/b/c/d i.e. (a/b) = (c/d) if we pass this term in side the equal to sign i.e.(a*d) = (b*c).
There is no any formula they just use a simple logic of a/b/c/d i.e. (a/b) = (c/d) if we pass this term in side the equal to sign i.e.(a*d) = (b*c).
(1)
Ramesh said:
9 years ago
They asked. How 5th proportional?
Sasulya said:
9 years ago
Just see diff. between 3 numbers and all are odd.
5 and 8 = 3 odd number.
8 and 15 = 7 odd number.
Then next odd num after 7 is 9.
5 and 8 = 3 odd number.
8 and 15 = 7 odd number.
Then next odd num after 7 is 9.
Main said:
10 years ago
It should be 8x15 = 90.
5 then the answer is 18 because 90/5 = 18.
5 then the answer is 18 because 90/5 = 18.
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