Western Australia (Australia) is 27 times larger than Portugal (Overseas Territories).
Area: 92,090 km2 World Factbook
Population: 10,813,834 (July 2014) World Factbook
Portugal, officially the Portuguese Republic, is a unitary semi-presidential republic. It is located in South-Western Europe, on the Iberian Peninsula, and it is the westernmost country of mainland Europe, being bordered by the Atlantic Ocean to the west and south and by Spain to the north and east. Wikipedia
Western Australia is a state occupying the entire western third of Australia. It is bounded by the Indian Ocean to the north and west, the Great Australian Bight and Southern Ocean to the south, the Northern Territory to the north-east and South Australia to the south-east. Wikipedia