KPI - Filter based on region

Hi,

I would like to get help on below scenario,

I have 3 regions,

and below are the KPI's :

 Here i would like to calculate the value for KPI5 using the below formula

Formula : 

Total(KPI2) = 0.616*0.023939+0.912*0.034996+0.837*0.040337

KPI5 = (KPI2-KPI1)*KPI3 / Total(KPI2) 

The total of KPI2 should change accordingly when the specific region in selected in the slicer