Referencing another query in custom column

Hi - I have a query that has one value in it.  I want to take that value, and divide it by the number of rows in another query. Then, subtract that value from all the rows in that second query.  I created a measure that taskes the single value and divides it by the row count, and that worked.  But I can't figure out how to reference the unique value produced by that measure and reduce every row by that value.  

E.g. I have a query (Query1) that I filtered down to just be 1 row, 1 column.  The value of that cell is $639,792.  On the visual screen, I did a quick measure that divided the $639,792 by the total number of rows (which for me is a count of how many weeks) in another query (Query2).  The value came out to $4300.  I now want to take that $4300 and subtract it from every row in Query2 in a custom column. For the sake of time, I have done a manual "subtract" of the $4300 to work for my presentation today, but I'd like it to be automated.