first, you find the actual distances of each planet.
Saturn: 8.867 x 108 = 957.636
Uranus: 1.787 x 109 = 194.783
To find how many times farther Uranus is from the sun than Saturn is, you divide the two.
957.636/194.783 = 4.9
Uranus is approximately 5 times farther from the sun than Saturn.