Calculating ratios using measures

Hello everyone,

I am new to PowerBI, and I have this calculation of ratio that I want to make in a measure, that has been bothering for quite some time now. I have searched for any possible solution, but I havn't gotten the result I was looking for.
Here is a sample of how my data is structured:

I want to calculate a productivity ratio in the following way: Production / (Available resources * capacity).
I would like to be able to add the productivity ratio together between different plants and different dates, so I can filter the productivity ratio based on other plant charateristics (big/small or new/old), but I simply cannot figure out how to do it in a measure, as it keeps adding up the capacity, which it is not supposed to. So I would like to know how to keep this constant in a measure.
My expected result would for example be that the combined productivity ratio for 01/01/2023 for LA and New York is 58,1%.

Any help would be much appreciated!