Madagascar is about 307 times bigger than Virgin Islands.

Virgin Islands is approximately 1,910 sq km, while Madagascar is approximately 587,041 sq km, making Madagascar 30,635% larger than Virgin Islands. Meanwhile, the population of Virgin Islands is ~105,413 people (28.1 million more people live in Madagascar).
Tip: This to-scale comparison of Virgin Islands vs. Madagascar uses the Mercator projection, which distorts the size of regions near the poles.