The Administrator  shall make such pro rata reductions to the allocations determined under subsection (a) as are necessary to comply with the requirements of subsection (c).
52 U.S. Code § 21002. Allocation of funds
(a) In generalSubject to subsection (c), the amount of a requirements payment made to a State for a year shall be equal to the product of—
the total amount appropriated for requirements payments for the year pursuant to the authorization under section 21007 of this title; and
(b) State allocation percentage definedThe “State allocation percentage” for a State is the amount (expressed as a percentage) equal to the quotient of—
the voting age population of the State (as reported in the most recent decennial census); and
the total voting age population of all States (as reported in the most recent decennial census).
(c) Minimum amount of paymentThe amount of a requirements payment made to a State for a year may not be less than—
(d) Pro rata reductions
(e) Continuing availability of funds after appropriation