The price of LCD TV is four times that of microwave oven, which is more than three times. It is understood that its price is more expensive than the microwave oven in 540 yuan.

So three times the microwave oven is equal to 540, so the price of microwave oven is 540 divided by 3 equal to180;

The price of LCD TV is equal to the price of microwave oven multiplied by 4, which is 180x4=720 yuan.