Double Lookup From Two Dimensional Table

I am trying to get a cell in my spreadsheet to look up a value based on two values. I have a dropdown list that lists the worksheets in the workbook, and each worksheet has a table with width measurements for the columns and height measurements for the rows. I have a function that is mostly working, it calls the data from the proper worksheet, but it rounds the measurement values down, and I need it to round to the next highest value on the table.

For instance, the measurement may be 55" x 55" in, but the table has values for 54" and 60". The current formula rounds down to the 54" measurement, but I need it to round up to the 60". I have attached what I have so far with further notes and cells highlighted.