iteratively calculate ratio of two columns, add values as new columns

I am able to add a new column to df by taking ratio of two existing columns. However having trouble doing this iteratively.

I have a df as below, with columns 'STRIKE','NAME','2015-08-09', '2015-08-10', '2015-08-11' etc. enter image description here

I would like to calculate the ratio of strike and each of the date column for each element, and add them as a new column.