How does Ralph represents civilization?

Ralph, whose overarching concern is the maintenance of the signal fire, is dedicated to the welfare of the entire group. He uses his power for the good of all.

The characters in Lord of the Flies possess recognizable symbolic significance, which make them as the sort of people around us. Ralph stands for civilization and democracy; Piggy represents intellect and rationalism; Jack signifies savagery and dictatorship; Simon is the incarnation of goodness and saintliness.