Using proportions, the value of x is given as follows: x = 16
A proportion is a fraction of a total amount, and the measures are related using a rule of three.
We are given this following proportion:
[tex]\frac{n}{4} = \frac{k}{x}[/tex]
In this problem, we have that n = 15 and k = 60, hence:
[tex]\frac{15}{4} = \frac{60}{x}[/tex]
Applying cross multiplication:
15x = 60 x 4
Simplifying by 15:
x = 4 x 4
x = 16.
More can be learned about proportions at https://brainly.com/question/24372153
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