Teaching Proportions

The recipe calls for 2 cups of flour for every 3 cups of sugar. Is

Is $$\frac{flour}{sugar}$$ $$\frac{3}{2}$$ a ratio or proportion?

In order to double the cookie recipe the ingredients will change:

$$\frac{flour}{sugar}$$ $$\frac{3}{2}=\ \frac{6}{4}$$ cups.

Is this an example of a ratio or a proportion?

At Fairfax County Public Schools, there is 1 teacher for every 14 students. Written another way,

$$Teachers:Students\ \ \ \ 1:\ 14$$

Is this an example of a ratio or a proportion?

Are these ratios proportional?

$$\frac{1}{3}=\frac{5}{15}$$

Are these ratios proportional?

$$\frac{5}{11}=\frac{40}{88}$$

Are these ratios proportional?

$$\frac{7}{9}=\frac{79}{89}$$

Which of the following ratios are proportional? Hint...there are two correct answers...select both.