What is the lowest rank of the United States, with fewer than 4 bronze medals?
CREATE TABLE "medal_table_by_country" (
  "rank" real,
  "nation" text,
  "gold" real,
  "silver" real,
  "bronze" real,
  "total" real
);
SELECT MIN("rank") FROM "medal_table_by_country" WHERE "nation"='united states' AND "bronze"<4;