Trying to divide specific cells in one column by specific cells in another column in Summary Sheet.

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Hello, I'm trying to divide cells in one column by cells in another column. After reviewing several similar questions I created this formula:

=SUM([SOR - # of Users Activated]72:[SOR - # of Users Activated]75 / SUM[SOR - # of Users Ordered]72:[SOR - # of Users Ordered]75)

This of course is not working, Could you advise if this can indeed be done and if so how I should change my formula, it is returning 'Invalid Operation'

Thanks!

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