The phrase "a proportionate part of" is correct and usable in written English.
It can be used when discussing the relative size or share of something in relation to a whole.
Example: "Each team member will receive a proportionate part of the bonus based on their contributions to the project."
Alternatives: "an appropriate share of" or "a corresponding portion of".
A deduction may also be taken for depreciation of a proportionate part of the cost of the property.
In making the computations which formed the basis of the decrees in the District Court it was assumed, that of the coal supplied to the several vessels which bunkered at Promised Land, a proportionate part of that received by each had come from the coal purchased from libelant.
Amash has not received a salary from Amash Imports since he became a congressman, but receives a proportionate part of the profits based on his partial ownership of the company.
As a speculation, it is a suitable, proportionate part of a risk-tolerant portfolio.
It stands to reason that when a grain is processed, some nutrients must be removed and also that the removal of any but an exactly proportionate part of any constituent of a seed will affect the nutritional quality of what is left.
On June 17 , 1905 the Burlington Company contracted with the packing company to carry export shipments from Kansas City, Kansas, of products named, until December 31 , 1905 at a rate the proportionate part of which from the Mississippi river to New York City was 23 cents per 100 pounds, as aforesaid.
The Court held that, consistent with the Due Process Clause, a State could base its tax assessments upon "the proportionate part of the value resulting from the combination of the means by which the business was carried on, a value existing to an appreciable extent throughout the entire domain of operation". Adams Express Co. v. Ohio State Auditor, 165 U.S. 194, 220-221, 17 S.Ct.
