Missouri is about 46 times bigger than South Georgia and South Sandwich Islands.

South Georgia and South Sandwich Islands is approximately 3,903 sq km, while Missouri is approximately 178,414 sq km, making Missouri 4,471% larger than South Georgia and South Sandwich Islands.
Tip: This to-scale comparison of South Georgia and South Sandwich Islands vs. Missouri uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: Missouri vs. South Georgia and South Sandwich Islands