Fort Lauderdale is about 4.6 times smaller than Venice.

Venice is approximately 415 sq km, while Fort Lauderdale (excluding the city's 9.9 sq km of water area) is approximately 90 sq km, making Fort Lauderdale 21.71% the size of Venice.
Tip: This to-scale comparison of Venice vs. Fort Lauderdale uses the Mercator projection, which distorts the size of regions near the poles.