I was thinking about how to prevent Gravity in 4d from decreasing with the cube of the distance and I was thinking that one way to slow down the rate that Gravity in 4d decreases with distance could be to use summations.
The equation I came up with is
F=Force, r=distance between the central parts of two fundamental particles, M1, and M2 are the masses of central parts of two fundamental particles, G is a constant that controls the strength of the Gravitational Force, and a controls the radius of the central part of the fundamental particles.
My idea is for each fundamental particle to be composed of an infinite number of groups of concentric hyperspheres. Each concentric hypersphere would have mass. The concentric hyperspheres in each group of hyperspheres would have a different density from the concentric hyperspheres in the other groups of concentric hyperspheres. Each concentric hypersphere would have the same density as the other concentric hyperspheres in its group of concentric hyperspheres.