Salt Lake City is about 4.2 times smaller than Los Angeles.

Los Angeles (including the city proper only) is approximately 1,215 sq km, while Salt Lake City is approximately 287 sq km, making Salt Lake City 23.64% the size of Los Angeles.
Tip: This to-scale comparison of Los Angeles vs. Salt Lake City uses the Mercator projection, which distorts the size of regions near the poles.
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