Montana is about 90 times bigger than French Polynesia.

French Polynesia is approximately 4,167 sq km, while Montana is approximately 376,979 sq km, making Montana 8,947% larger than French Polynesia. Meanwhile, the population of French Polynesia is ~299,356 people (690,059 more people live in Montana).
Tip: This to-scale comparison of French Polynesia vs. Montana uses the Mercator projection, which distorts the size of regions near the poles.