Etymology
Meaning
Proportional refers to a relationship between two variables where one variable changes at a constant rate in relation to the other variable.
Origin
The concept of proportionality dates back to ancient times. In the 6th century BCE, the Greek philosopher Pythagoras discovered the proportionality of the sides of right triangles, known as the Pythagorean theorem.
In the 13th century, the Italian mathematician Fibonacci developed the Fibonacci sequence, where each number is the sum of the two preceding numbers. The Fibonacci sequence exhibits proportionality, as the ratio of consecutive numbers approaches the golden ratio (approximately 1.618).
The term "proportion" was first used in English in the 14th century, and "proportional" was first used in the 16th century. The concept of proportionality has been widely used in various fields, including mathematics, science, engineering, and art.
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