The International Olympic Committee took the first step toward naming the host cities for the 2024 and 2028 Summer Games simultaneously this summer, amid growing support for a plan to award those Games to Paris and Los Angeles, respectively.

At meeting in Lausanne, Switzerland, on Friday, the IOC executive board ratified a proposal to name the host cities at the same time, a move which departs from the normal procedure of soliciting and reviewing bids for each Olympiad individually. The proposal will now be put to a vote by...