4.2 is what percent of 1540 - 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 1540 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 1540, so we can write it down as 100%=1540.
4. We know, that x% equals 4.2 of the output value, so we can write it down as x%=4.2.
5. Now we have two simple equations:
1) 100%=1540
2) x%=4.2
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%=1540/4.2
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 4.2 is what percent of 1540

100%/x%=1540/4.2
(100/x)*x=(1540/4.2)*x       - we multiply both sides of the equation by x
100=366.66666666667*x       - we divide both sides of the equation by (366.66666666667) to get x
100/366.66666666667=x
0.27272727272727=x
x=0.27272727272727

now we have:
4.2 is 0.27272727272727% of 1540