One-fourth is mentioned in the Quran in these verses:

[4:12] You get half of what your wives leave behind, if they had no children. If they had children, you get one-fourth of what they leave. All this, after fulfilling any will they had left, and after paying off all debts. They get one-fourth of what you leave behind, if you had no children. If you had children, they get one-eighth of what you bequeath. All this, after fulfilling any will you had left, and after paying off all debts. If the deceased man or woman was a loner, and leaves two siblings, male or female, each of them gets one-sixth of the inheritance. If there are more siblings, then they equally share one-third of the inheritance. All this, after fulfilling any will, and after paying off all debts, so that no one is hurt. This is a will decreed by God. God is Omniscient, Clement.

To learn more, read the Quran in English.

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