Jiaxing (China) is 3.8 times larger than Yongkang, Zhejiang.
Area: 4,059 km2 calculated
Jiaxing is a prefecture-level city in northern Zhejiang province, People's Republic of China. Lying on the Grand Canal of China, Jiaxing borders Hangzhou to the southwest, Huzhou to the west, Shanghai to the northeast, and the province of Jiangsu to the north. Wikipedia
Area: 1,065 km2 calculated
Yongkang is a county-level city located in the central part of Zhejiang province, People's Republic of China. It has an area of 1,049 km² and a population of 536,000 with more than 100,000 non-resident workers. Wikipedia