0.387 is what percent of 3 - step by step solution

To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 3 is 100% - because it's the output value of the task.
2. We assume, that x is the value we are looking for.
3. If 100% equals 3, so we can write it down as 100%=3.
4. We know, that x% equals 0.387 of the output value, so we can write it down as x%=0.387.
5. Now we have two simple equations:
1) 100%=3
2) x%=0.387
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
100%/x%=3/0.387
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 0.387 is what percent of 3

100%/x%=3/0.387
(100/x)*x=(3/0.387)*x       - we multiply both sides of the equation by x
100=7.7519379844961*x       - we divide both sides of the equation by (7.7519379844961) to get x
100/7.7519379844961=x
12.9=x
x=12.9

now we have:
0.387 is 12.9% of 3