What is the area of the place that has a population density of 331.4?
CREATE TABLE "population_area_and_density_sortable_on_" (
  "province" text,
  "population_2004_estimate" real,
  "area_km" real,
  "density" text,
  "gdp_2003_pps_in_mil" real,
  "gdp_per_cap_2003_in" real
);
SELECT MAX("area_km") FROM "population_area_and_density_sortable_on_" WHERE "density"='331.4';