Saudi Arabia dwarfs United States: about 1,925,871 km² km² against 9,439,424 km² km². At true size Saudi Arabia is about 4.9× larger — the whole of United States fits into Saudi Arabia roughly 4 times.
Saudi Arabia sits in Asia, United States in North America. On the old Mercator map the latitude gap distorted how large each felt beside the other; at true size the answer is simply 4.9×.
The old map muddied it further: Mercator inflates Saudi Arabia about 1.2× and United States about 2×, so on a Mercator-style map this pair appears 8.1× apart instead of the true 4.9×.
Saudi Arabia fits 4× into United States.