Alaska is about 1.2 times bigger than South Africa.

South Africa is approximately 1,219,090 sq km, while Alaska is approximately 1,481,348 sq km, making Alaska 22% larger than South Africa. Meanwhile, the population of South Africa is ~57.5 million people (56.8 million fewer people live in Alaska).
Tip: This to-scale comparison of South Africa vs. Alaska uses the Mercator projection, which distorts the size of regions near the poles.