SAT Question 825b7490: Ratios Rates Proportional Relationships And Units answer and explanation with Desmos solution

It's given that the ratio $140$ to $m$ is equivalent to the ratio $4$ to $28$. Therefore, the value of $m$ can be found by solving the equation $\frac{140}{m}=\frac{4}{28}$. Multiplying each side of this equation by $m$ yields $140=\frac{4m}{28}$. Multiplying each side of this equation by $28$ yields $3,920=4m$. Dividing each side of this equation by $4$ yields $980=m$. Therefore, the value of $m$ is $980$.