Fort Worth, Texas is 2.8 times larger than Las Vegas.
Area: 1,011 km2 calculated
Population: 777,992 (2012)
Fort Worth is the 17th-largest city in the United States of America and the fifth-largest city in the state of Texas. Wikipedia
Area: 363 km2 calculated
Population: 596,424 (2012)
Las Vegas, officially the City of Las Vegas and often known as simply Vegas, is the most populous city in the state of Nevada and the county seat of Clark County. Wikipedia