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 3 of 4.
Meer showkat said:
5 years ago
If we have 3 or 5 numbers in a proportion, then how to find the last number?
(4)
Sumitra said:
1 decade ago
It should be like this 5:8::15:x.
Then 5/8 = 15/x.
x = 15*8/5.
x = 24.
Then 5/8 = 15/x.
x = 15*8/5.
x = 24.
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.
Bii said:
6 years ago
In that case 8/15 and 15/24 are not equal. The answer is 28.
(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)
Samim said:
1 decade 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.
Reethrose said:
1 decade ago
5:8::15:?
5*3=15
8*3=24
so the answer is 24.
5*3=15
8*3=24
so the answer is 24.
Riba said:
8 years ago
@Kirshna.
The answer is 32.
8/15 = x/60.
The answer is 32.
8/15 = x/60.
Manish said:
6 years ago
Product of means = product of extremes.
(1)
Jaskaran said:
1 decade ago
How come 5x ? Please explain in detail.
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