MATH not constitution: Electoral College = Reps + Senators
From Wikipedia: Apportionment
The number of voting seats in the House of Representatives has been 435 since 1913, capped at that number by the Reapportionment Act of 1929—except for a temporary (1959–1962) increase to 437 when Alaska and Hawaii were admitted into the Union.[3] The Huntington–Hill method of equal proportions has been used to distribute the seats among the states since the 1940 census reapportionment.[1][4]
The only reason it is set to 435 was political from 1929, and that a large house body is harder to manage. Time for a change!
TL;DR: the size of the house is not in the constitution. REVERT the 1929 law, so that the smallest state sets how many voters each rep represents, and the EC is fixed, no amendment needed. Or, some smaller number that accomplishes the same thing.
EDIT: PhillyWill did one possible variation of the math:
Hmmmm… USA population in 1929 was about 121,800,000. Divide that by 435 and you get 1 House seat per 280,000 population. We’re now at a bit over 331,000,000. Divide by 280,000 and you get 1,182 house seats.
Under that rubric, California would get 142 seats, next Texas with 103 (most of which would be concentrated in well educated urban areas). Florida gets 77, New York has 69, and so on. The Philadelphia metro area with a population of 5,717,00 would get 20 of PA’s 45.
The red states will become completely irrelevant in the House, add DC and Puerto Rico as states and no Republican administration of the current sort will ever hold us hostage again.