Tanzania is about 3.8 times bigger than Wyoming.

Wyoming is approximately 251,489 sq km, while Tanzania is approximately 947,300 sq km, making Tanzania 277% larger than Wyoming. Meanwhile, the population of Wyoming is ~563,626 people (63.3 million more people live in Tanzania).
Tip: This to-scale comparison of Wyoming vs. Tanzania uses the Mercator projection, which distorts the size of regions near the poles.