South Africa is about 1.2 times smaller than Alaska.

Alaska is approximately 1,481,348 sq km, while South Africa is approximately 1,219,090 sq km, making South Africa 82.3% the size of Alaska. Meanwhile, the population of Alaska is ~710,231 people (56.8 million more people live in South Africa).
Tip: This to-scale comparison of Alaska vs. South Africa uses the Mercator projection, which distorts the size of regions near the poles.