The phrase "in different proportions" is correct and usable in written English. It is typically used to describe the fact that different components make up a whole. For example, you might say "The ingredients of this dish are blended in different proportions to create the perfect flavor."
It found that Mars and Earth were made up of similar materials, but in different proportions.
"The same people keep coming back, in different proportions, but they are the same people".
GEORGE PACKER: They aren't completely separable, and both always exist in different proportions at the same time.
While UK newspapers publish much more content by men, audiences share content by women in different proportions.
During CSP2 and R2, weight loss and gain occurred in different proportions.
Samples containing three genetically modified (GM) crops in different proportions were used to validate the method.
doi: 10.1029/2005WR004433], in which saltwater and freshwater were mixed in different proportions.
This trend has affected Computer Science programs throughout the world in different proportions.
The two powders were granulated in different proportions using carboxymethylcellulose (CMC) as the binder.
CSA was prepared by mixing CSA clinker and re-crystallized gypsum in different proportions.
Radial and tangential migratory patterns are both present in rodents and primates, but in different proportions.
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MA of Applied Linguistic, Maquarie University, Australia