The phrase "and a considerable proportion" is correct and usable in written English.
It can be used when discussing a significant part or percentage of a whole in various contexts, such as research, statistics, or general observations.
Example: "The survey revealed that a considerable proportion of respondents preferred online shopping over traditional retail."
Alternatives: "a significant portion" or "a large percentage".
Hundreds of thousands of patents are issued each year, and a considerable proportion are for chemicals – how they can be used and how to make them.
Crystal City, which was once an active river port, now has a population of about four thousand, with a preponderance of Italians, Greeks, French, and Slavs, and a considerable proportion of Negroes.
Many people feel a strong urge to write, and a considerable proportion of them have a desire to express their thoughts and feelings through the powerful, often emotive medium of poetry.
In content validity tests, 2 90% of respondents protested against a feature of the survey, and a considerable proportion found DCEs to be incomprehensible or inconsequential (17 40% and 10 62% respectively).
Germany's bank assets total 326% of its GDP and a considerable proportion of those assets are in the form of loans to Greece and other indebted southern European countries.
Belarus remains heavily dependent on Russia to meet its own energy needs, and a considerable proportion of Russian oil and gas exports to Europe pass through it.
Although some of the variability in toxicity is accounted for by variations in drug pharmacokinetics (PK), differences in co-morbidity (cardiac, liver or renal diseases), and predisposing factors (gender and age), a considerable proportion remains unexplained.
Because NACT exposure and observation periods were limited in this study and because a considerable proportion of study patients are currently undergoing adjuvant therapy after surgery, patient prognosis needs to be further assessed.
Professor Wendy Savage, a gynaecologist and campaigner, has defended the "very small" number of abortions that take place over 20 weeks and said a considerable proportion are of foetuses with a congenital abnormality, some of which will not be picked up until a late stage in the pregnancy.
For those of you whose football knowledge doesn't extend beyond the all powerful Premier League, Hereford is a small professional club that has sadly (and for a considerable proportion of its history) languished at or near the bottom of the football league.
However, combat wounds can be extensive and involve a considerable proportion of the limb.
