Question

law of constant proportion is proposed by

Answer 1

it was proposed by joseph proust

Answer 2

$heya \\ \\ law \: of \: constant \: is \: also \: known \: as \: law \: of \: definite \: . \\ \\ it \: is \: proposed \: by \: joseph \: proust \: . \\ \\ hope \: this \: helps \: you$