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.
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)
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)
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)
Ramya Reddy said:
2 years ago
5*3 = 15
8*3 = 24 that's the answer.
8*3 = 24 that's the answer.
(13)
Rahul v said:
3 years ago
The number of proportional are only in even numbers that's why they are proportional.
(1)
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)
Meer showkat said:
5 years ago
If we have 3 or 5 numbers in a proportion, then how to find the last number?
(4)
Ramu Kanojiya said:
5 years ago
Thanks all.
(1)
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)
Bii said:
6 years ago
In that case 8/15 and 15/24 are not equal. The answer is 28.
(1)
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