Recalculate Cell Values To New Values

I am trying to write code that runs a calculation on each cell in a range and replaces the current value with the calculated one. The calculation is very straightforward (see green range in example file)- instead of the absolute value in a cell (yellow range) it displays the ratio of said cell value to a value from another column (blue range). Basically, after running the macro, the green cells (just formatted for ease of reference) would replace the yellow ones.