"proportion of about" is a correct and usable phrase in written English.
You can use it when you are talking about a quantity that is an approximate part or percentage of something. For example, "There is a proportion of about 80% of people who voted yes."
Sushi, at its most basic, consists of a finger of rice draped with a slice of raw fish, ideally in a proportion of about 4 to 1, according to Nobu Ishida, whose Apollo Fish Company, in Maspeth, N.Y., supplies top sushi chefs in New York at Nobu, Masa and Sushi Yasuda.
By adopting this solution, the geothermal station covers in a proportion of about 72%% the thermal energy required by the district heating system.
The SGoF's FDR plot (Figure 2C) indicated that this maximum detection led to a false discovery proportion of about 35%.
Incinerators use combustion to reduce waste into ash, gas, and heat in a volume proportion of about nine to one.
We obtain a surface compositional proportion of about 70% of orthopyroxene and 30% of clinopyroxene for both asteroids.
The current government planned last autumn to reduce public spending over the next five years to 35% of GDP compared with the current proportion of about 40%.
The populations that are in each group (iii) and (iv) shared the same genetic background, with average membership proportions of about 0.5 and 0.7, respectively (see Additional file 5: Table S3).
Doctors agree that a small proportion of men - about 0.5% - need testosterone therapy.
"The proportion of complaints about ads that relate to concerns about children is minuscule," he says.
Significantly, the types of people written about changed dramatically, too: the proportion of profiles about entertainment figures rose from twenty-six per cent, in the earlier period, to fifty-five per cent, in the later period, while the proportion of profiles about political and business figures declined.
In vivo, the forages were fed in proportions of about 3/4 of the total diet to 30 animals allocated to five groups in a randomized complete block design.
