South Dakota is about 47 times bigger than French Polynesia.

French Polynesia is approximately 4,167 sq km, while South Dakota is approximately 196,540 sq km, making South Dakota 4,617% larger than French Polynesia. Meanwhile, the population of French Polynesia is ~299,356 people (514,824 more people live in South Dakota).
Tip: This to-scale comparison of French Polynesia vs. South Dakota uses the Mercator projection, which distorts the size of regions near the poles.