The mass of Venus is 4.87 x 10^24 kilograms, and the mass of Jupiter is 1,898 x 10^24 kilograms.The mass of Jupiter is about _____ times the mass of Venus.

Mass Jupiter / mass of venus = 1898 * 10^24 / 4.87 * 10^24 = 1898 / 4.87 = 390 times heavier. I hope that comma is correct.