Trairāśika is the Sanskrit term used by Indian astronomers and mathematicians of the pre-modern era to denote what is known as the "rule of three" in elementary mathematics and algebra. In the contemporary mathematical literature, the term "rule of three" refers to the principle of cross-multiplication which states that if a b = c d {\displaystyle {\tfrac {a}{b}}={\tfrac {c}{d}}} then a d = b c {\displaystyle ad=bc} or a = b c d {\displaystyle a={\tfrac {bc}{d}}} .
Trairāśika is the Sanskrit term used by Indian astronomers and mathematicians of the pre-modern era to denote what is known as the "rule of three" in elementary mathematics and algebra. In the contemporary mathematical literature, the term "rule of three" refers to the principle of cross-multiplication which states that if a b = c d {\displaystyle {\tfrac {a}{b}}={\tfrac {c}{d}}} then a d = b c {\displaystyle ad=bc} or a = b c d {\displaystyle a={\tfrac {bc}{d}}} .
Source: Wikipedia "Trairāśika" · CC BY-SA 4.0
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