Philippines is about 1.5 times bigger than South Dakota.

South Dakota is approximately 196,540 sq km, while Philippines is approximately 300,000 sq km, making Philippines 53% larger than South Dakota. Meanwhile, the population of South Dakota is ~814,180 people (113.8 million more people live in Philippines).
Tip: This to-scale comparison of South Dakota vs. Philippines uses the Mercator projection, which distorts the size of regions near the poles.