Finding the intersecting point of table based off of two separate cells

Ill try my best to explain this short and sweet

I'm trying to take the Height and Width measurements and match them up to the charts axes on the right and then find the intersecting points within that chart to then pull that number and drop it in the "size factor" column

EX: Height = 4"
Width = 48"


*Find 4" on Y AXIS and find 48" on X AXIS and the intersecting points of those row/columns*

Size factor would = 1.92 (as shown on the chart)

*put 1.92 in the "size factor" column on the same row as the original measurements (4 and 48)*

I would like to have this automated with some sort of function but I have no idea what to use or how to word it.

Thank you!

Thank you!