(mx2+nx1/m+n, my2+ny1/m+n , mz2+nz1/m+n)
(mx2-nx1/m-n , my2-ny1/m-n , mz2-nz1/m-n)
The Calculator to find the Coordinates of Point Externally/Internally. When Given two points and the externally or internally ration m : n, then you could get the coordinate of P.