Fort Lauderdale is about 86,014 times smaller than Australia.

Australia is approximately 7,741,220 sq km, while Fort Lauderdale (excluding the city's 9.9 sq km of water area) is approximately 90 sq km, making Fort Lauderdale 0.0% the size of Australia.
Tip: This to-scale comparison of Australia vs. Fort Lauderdale uses the Mercator projection, which distorts the size of regions near the poles.