Meaning of “proportional” in the English Dictionary

"proportional" in British English

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proportionaladjective

uk /prəˈpɔː.ʃən.əl/ us /prəˈpɔːr.ʃən.əl/ also proportionate,
proportionally
adverb uk /prəˈpɔː.ʃən.əl.i/ us /prəˈpɔːr.ʃən.əl.i/ also proportionately,

Unemployment is proportionally much higher in the north of the country.

(Definition of “proportional” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"proportional" in American English

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proportionaladjective

us /prəˈpɔr·ʃə·nəl/ also proportionate, /prəˈpɔr·ʃə·nət/

in correct relation to:

The degree of punishment is meant to be proportional to the seriousness of the crime.

mathematics Proportional also means that two things have the same size relationship or ratio.

proportionally
adverb /prəˈpɔr·ʃə·nəl·i/ also proportionately, /prəˈpɔr·ʃə·nət·li/

(Definition of “proportional” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"proportional" in Business English

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proportionaladjective

uk /prəˈpɔːʃənəl/ us also proportionate

if two amounts are proportional, they change at the same rate, so that the relationship between them does not change:

proportional to sth They introduced an annual property tax proportional to the market value of the property.
directly proportional (to sth)

if two amounts are directly proportional, when one increases, the other increases and when one goes down, the other goes down:

CO2 emissions from motor vehicles are directly proportional to the amount of fuel consumed and its carbon content.
inversely proportional (to sth)

if two amounts are inversely proportional, when one increases, the other goes down and when one goes down, the other increases:

E-business knowledge is generally inversely proportional to both age and rank in the organisation.

(Definition of “proportional” from the Cambridge Business English Dictionary © Cambridge University Press)