'Part' in the Bible

And there was a great famine in Samaria; and behold, they besieged it, until an ass's head was worth eighty silver-pieces, and the fourth part of a cab of dove's dung five silver-pieces.

And he commanded them saying, This is the thing which ye shall do: a third part of you, that come in on the sabbath, shall be keepers of the watch of the king's house;

and a third part shall be at the gate of Sur; and a third part at the gate behind the couriers; and ye shall keep the watch of the house for a defence.