51.6 is what percent of 1290 - 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 1290 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 1290, so we can write it down as 100%=1290.
4. We know, that x% equals 51.6 of the output value, so we can write it down as x%=51.6.
5. Now we have two simple equations:
1) 100%=1290
2) x%=51.6
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%=1290/51.6
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 51.6 is what percent of 1290

100%/x%=1290/51.6
(100/x)*x=(1290/51.6)*x       - we multiply both sides of the equation by x
100=25*x       - we divide both sides of the equation by (25) to get x
100/25=x
4=x
x=4

now we have:
51.6 is 4% of 1290