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 1 of 4.
Ramya Reddy said:
2 years ago
5*3 = 15
8*3 = 24 that's the answer.
8*3 = 24 that's the answer.
(13)
Arijit said:
5 years ago
If a:b :: c:d then;
d = b*c/a (Formula),
Here, d is called the fourth proportion of a, b and c.
d = b*c/a (Formula),
Here, d is called the fourth proportion of a, b and c.
(11)
Pranav said:
1 year ago
Here is the solution
Let's write 5, 8, 15, X.
= (5/8) : (15/x),
= 15/x * 8/5,
Then x.= 3*8.
So, the Answer = 24.
Let's write 5, 8, 15, X.
= (5/8) : (15/x),
= 15/x * 8/5,
Then x.= 3*8.
So, the Answer = 24.
(5)
Sandeep said:
5 years ago
5:8:15:x.
5/8=15/x.
When dividing 15 by 5, its come=3(upper parts are divided ).
Now multiply crossing,
x=24.
5/8=15/x.
When dividing 15 by 5, its come=3(upper parts are divided ).
Now multiply crossing,
x=24.
(5)
Meer showkat said:
5 years ago
If we have 3 or 5 numbers in a proportion, then how to find the last number?
(4)
Sumit Singh said:
11 months ago
The formula for finding the fourth proportional = b*c/a.
A = 5, B = 8, C = 15,
8*15/5 = 24.
A = 5, B = 8, C = 15,
8*15/5 = 24.
(3)
Jay said:
8 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)
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)
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)
Akash said:
2 months ago
Formula:
x = b * c/a.
Then substitue the given values;
8 * 15/5 = 120/5.
x = 24.
x = b * c/a.
Then substitue the given values;
8 * 15/5 = 120/5.
x = 24.
(1)
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