Question

which proportion could you use to convert 9 kilometers to meters?
$\frac{1,000 \text{ meters}}{1 \text{ kilometer}}=\frac{? \text{ meters}}{9 \text{ kilometers}}$
$\frac{10 \text{ meters}}{1 \text{ kilometer}}=\frac{? \text{ meters}}{9 \text{ kilometers}}$
convert.
9 kilometers = meters

Explanation:

Step1: Recall conversion factor

We know that 1 kilometer = 1000 meters. So the correct proportion for conversion is $\frac{1000\text{ meters}}{1\text{ kilometer}}=\frac{?\text{ meters}}{9\text{ kilometers}}$.

Step2: Use proportion to calculate

Let the number of meters in 9 kilometers be $x$. Then $\frac{1000}{1}=\frac{x}{9}$. Cross - multiplying gives $x = 1000\times9$.
$x=9000$.

Answer:

9000