Why is men allowed to marry 4 times in Islam but women isnt? Shouldn't it be that men shouldnt be allowed to marry 4 times also?

What is narrated is that normally, number of women is much higher than men. Hence, if each man got married with one woman, many women will stay unmarried.
On the other hand, we have to take into consideration that the man is not allowed to marry more than one woman, if he can not be just with them.