There’s a spectrum of ways to reform the House using proportional representation. Two key factors are how many representatives a multi-member district would have and how winners of House seats would be proportionally allocated.
In 2021, Rep. Don Beyer of Virginia led a group of other House Democrats in reintroducing a proposal that’s been floating around Congress since 2017. The Fair Representation Act would require states to use ranked choice voting for House races. It calls for states with six or more representatives to create districts with three to five members each, and states with fewer than six representatives to elect all of them as at-large members of one statewide district.
The nominal size of the Bundestag is just below 600 seats. Extraneous seats from directly elected representatives and the necessary amount of extra seats for other parties currently add another 138 seats for a total of 736 MdBs.Which is quite large for 83 million citizens. Imagine having a 2500 seat Congress.
Relative representation continues in the Bundesrat, the Senate equivalent, too. The 16 States have seats relative according to the number of citizens. Small States have less, larger have more representatives. It is not overly proportional, though. Northrhine-Westphalia has six seats, despite having way more citizens than a number of other States together, but it is still way better than having the same number like e.g California and any flyover state.