French Polynesia is about 47 times smaller than South Dakota.

South Dakota is approximately 196,540 sq km, while French Polynesia is approximately 4,167 sq km, making French Polynesia 2.12% the size of South Dakota. Meanwhile, the population of South Dakota is ~814,180 people (514,824 fewer people live in French Polynesia).
Tip: This to-scale comparison of South Dakota vs. French Polynesia uses the Mercator projection, which distorts the size of regions near the poles.