8.4 is what percent of 171.2 - 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 171.2 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 171.2, so we can write it down as 100%=171.2.
4. We know, that x% equals 8.4 of the output value, so we can write it down as x%=8.4.
5. Now we have two simple equations:
1) 100%=171.2
2) x%=8.4
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%=171.2/8.4
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 8.4 is what percent of 171.2

100%/x%=171.2/8.4
(100/x)*x=(171.2/8.4)*x       - we multiply both sides of the equation by x
100=20.380952380952*x       - we divide both sides of the equation by (20.380952380952) to get x
100/20.380952380952=x
4.9065420560748=x
x=4.9065420560748

now we have:
8.4 is 4.9065420560748% of 171.2