I'm not sure what the question is asking?
But, a part is a fraction of a whole.
For instance: 1/2 is a half of a whole, or 50% of 100%
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A percentage.
A proper fraction can represent a comparison between a part (the numerator) and the whole (the denominator).
A percentage is a comparison between a part and a whole. The part [presumably] is the number of deaths in the US but the total is unclear. It could bethe population of the US so that the comparison is the mortality rate in the US,the number of deaths daily in the world so that the comparison is between the US and the world,the number of deaths in the US in a week/month/year so the comparison is between a specific day and a longer period.
A fraction is part of a whole number.
A ratio is a comparison of parts in a whole. Both parts of a ratio will work out less than 1, so would never be a mixed number. eg ratio of oil to petrol of 1:25, total number of parts = 26, so fraction of oil = 1 / 26 and fraction of petrol = 25 / 26 * * * * * A ratio does not have to be a comparison of parts to a whole. It can also be in the reverse form: comparison of a whole to a part. Thus, the ratio of a year to a week (in a non-leap year) would be 365 : 7. In fractional form that would be 521/7