How does the author make use of concepts of similar figures to compare the height, weight, and amount of food consumption by Brobdingnagians and Lilliputians?

So yeah basically this is math-related about ratio and proportions, all you gotta do is say how Jonathan Swift use similar figures to compare their height, weight, and amount of food consumption between Brobdingnagians (Giants) and Lilliputians (Miniature People)