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The phrase "a fourth factor was" is correct and usable in written English.
You can use it when introducing an additional element or consideration in a discussion or analysis, particularly in academic or formal writing.
Example: "In our study of environmental impacts, a fourth factor was the influence of urban development on local ecosystems."
Alternatives: "an additional factor was" or "a fourth element was".
Exact(3)
A fourth factor was the change that took place in the 1960s in the university's and the local authority's attitude to industrial development in the town.
A fourth factor was 'time of day' (i.e. AM session/PM session).
For women whose partners were present at the birth, a fourth factor was identified 'Partner Involvement'.
Similar(56)
A fourth factor is the national political environment, as measured by the generic Congressional ballot.
A fourth factor is the damage to the EU's image as a well-governed entity, an important basis for the EU's attraction as a soft power.
A fourth factor, is heavy day time rainfall in the wet season; which could help explain why thermal stratification sometimes does not occur in this season (Fig. 2).
A fourth factor is mixture of people with different ethnic backgrounds or countries of origin.
A second factor was learning to relax before matches.
A third factor was that social policy stories had multiple human interest angles.
And a third factor was a rating downgrade of bonds backed by revenue from legal settlements with tobacco companies.
A third factor was the continuous development of medical technology, such as new equipment and labour-intensive procedures.
Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com