You do the same way as with whole numbers.
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use proportions
Ratios or fractions can be used to present proportions.
Yes. Fractions refer to the same thing whereas proportions may refer to different objects.For example, 1 egg is 1/200 of 200 eggs,100 grams of flour make 1/400 of 40000 grams of flour. Both these are fractions.However, 1 egg to 200 grams of flour is a proportion. One egg is not 1/200 of 200 grams of flour!
Fractions are prevalent in nature and can be observed in various forms. For instance, the ratio of the golden ratio (approximately 1.618) can be seen in the arrangement of leaves around a stem, known as phyllotaxis. Additionally, the division of a fruit's seeds, like the segments in an orange, often reflects fractional patterns. Even the proportions of different species in an ecosystem can be represented as fractions, illustrating their relative abundance.
proportions are used in scale factors; scale factors ARE proportions