Breaking point analysis | Delineation of functional region Sphere of influence

In the 6th column 1st row of the table will be pj/pi, then it Will be √pj/pi
pj/pi
= 90000/700000
= 0.1286
After that, √pj/pi
= √0.1286
= 0.3586

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Sir Sphare of Influence by Gravity Model Ki Aki ?