Why did the King of Lilliput serve 1728 meals to Gulliver?
This is because the volume of two objects that resemble each other in three dimensions is proportional to the cube of length.
Since Gulliver’s height is about 12 times larger than the people of Lilliput, Gulliver’s volume is 123 = 1728 times than Lilliput.
However, the larger the body, the easier it is to maintain body temperature and the lower the basal metabolic rate, so the actual amount of meal does not increase by the cube of height.