Fort Worth, Texas is 3.8 times larger than Arlington, Texas.
Area: 265 km2 calculated
Population: 375,600 (2012)
Arlington is a city in the U.S. state of Texas, within the Dallas–Fort Worth–Arlington metropolitan area and Tarrant County. According to the U.S. Wikipedia
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