DAX To filter data based on another measure

[bipro-atlanta]

I am looking  to filter Measure based on value Present.  So in example below i am looking to average out based on only values sold .. For Example i have three rows of sales but 4 rows of allocation , but i should only use Sales with  Allocation . Which is 3 Rows of Sales should be divided by 3 rows of allocation instead of four.. Can you kindly suggest on how use a DAX ..  Filter Value where Sales is not blank / Allocation Where sales is not blank 

[Anonymous]

If you want to just display the value this will work for returning the correct total and only the products that contain a sale.

Count of Products with a Sale:= Countrows(Calculatetable('Sales', Not(ISBLANK('Sales'[Sale]))  * This may be altered, just not sure the grain of your data.  But this will return the table where the statement is true *
Allocation of Product w/ Sale: SUMX(Filter(Values('Sales'[Product]), NOT(ISBLANK([Count of Products with a Sale])),calculate(SUM('Sales'[Allocation])))

If you just want the grand totals to reflect that logic you will need to do an if statement on the product.  ISFiltered('Sales'[Prodcut])

[HotChilli]

If the allocation is always "1" then

Measure 3 = 
  DIVIDE(SUM(Table1[Sale]), COUNTROWS(FILTER(Table1, Table1[Sale] <> BLANK())))

[bipro-atlanta]

Allocation is not always 1 .. It based on number of days selected in date range.. 

[tarunsingla]

Measure 3 = DIVIDE(SUM(Table1[Sale]), SUMX(FILTER(Table1, Table1[Sale] <> BLANK()), Allocation))

https://docs.microsoft.com/en-us/dax/sumx-function-dax#example