Question

The unchanging value of the ratio between two proportional quantities?

Answer 1

The right answer is the constant of proportionality

If two variables are related and this relationship is that there is a constant ratio between them, then we are talking about proportionality. There are two types of proportionality.

1) Direct Proportionality:

In a mathematical language this is given by this equation:

$y=kx$

where $k$ is in fact this constant of proportionality. If $x$ increases, $y$ also increases at the same rate. On the other hand,  If $x$ decreases, $y$ also decreases at the same rate.

2) Inverse Proportionality:

In a mathematical language this is given by this equation:

$y=\frac{k}{x}$

where $k$ is also called the constant of proportionality. If $x$ increases, $y$ decreases at the same rate. On the other hand,  If $x$ decreases, $y$ increases at the same rate.

Answer 2

It should be the constant of proportionality