The phrase "a proportionately high" is correct and usable in written English.
It can be used when discussing a quantity or level that is relatively large compared to another quantity or level in a specific context.
Example: "The study found that there was a proportionately high number of participants who reported feeling satisfied with the service."
Alternatives: "relatively high" or "comparatively large".
A place may get a proportionately high amount of stories but they might be filled with stories about crime and decay.
While 1,800 people were arrested at that 2004 convention, there were a proportionately high number of arrests in St . Paul where the protests were much smaller.
And, compared to its population of 14m people, it has a proportionately high number of refugees - 8.5 for every 1,000 people.
Not surprisingly, given Canada's high volume of corporations operating in the energy and resource sectors, there is a proportionately higher degree of exposure to environmental proposals.
The politics of the cartel required that every member receive a proportionately higher share under the new allocations, even though Venezuela is producing 700,000 barrels a day, a fraction of its new quota, 2.82 million.
This was further confirmed when beads of batch F9 were prepared using a proportionately higher amount of ceftriaxone sodium per gram of the polymer blend.
Type-II specific myosin ATPase isoforms require 1.6- to 2.1-fold more ATP per unit force production than type I and therefore require a proportionately higher oxidative phosphorylation [95].
If the money is used to buy back shares, the remaining shareholders are rewarded with a proportionately higher ownership interest — and this kind of dividend is taxed only when the company earns it.
The European familiarity with unlocked phones could also drive continental hackers to tamper with Apples lockdown on the iPhone at a proportionately higher rate than Americans have, so that the device can be used on any carrier and also run unsanctioned software.
If one factors in the presence of mutator mutations, or other mechanisms of genetic instability, a proportionately higher number of mutations is obtained.
A larger genome will thus always receive a proportionately higher rate of transposition.
