45 is what percent of 878 - 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 878 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 878, so we can write it down as 100%=878.
4. We know, that x% equals 45 of the output value, so we can write it down as x%=45.
5. Now we have two simple equations:
1) 100%=878
2) x%=45
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%=878/45
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 45 is what percent of 878

100%/x%=878/45
(100/x)*x=(878/45)*x       - we multiply both sides of the equation by x
100=19.511111111111*x       - we divide both sides of the equation by (19.511111111111) to get x
100/19.511111111111=x
5.125284738041=x
x=5.125284738041

now we have:
45 is 5.125284738041% of 878