We theoretically investigate the temperature-dependent static susceptibility and long-range magnetic coupling of three-dimensional (3D) chiral gapless electron-hole systems (semimetals) with arbitrary band dispersion [i.e., epsilon(k) similar to k(N), where k is the wave vector and N is a positive integer]. We study the magnetic properties of these systems in the presence of dilute random magnetic impurities. Assuming carrier-mediated Ruderman-Kittel-Kasuya-Yosida indirect exchange interaction, we find that the magnetic ordering of intrinsic 3D chiral semimetals in the presence of dilute magnetic impurities is ferromagnetic for all values of N. Using finite-temperature self-consistent field approximation, we calculate the ferromagnetic transition temperature (T-c). We find that T-c increases with increasing N due to the enhanced density of states, and the calculated T-c is experimentally accessible, assuming reasonable coupling between the magnetic impurities and itinerant carriers.