Question

complete the ratio table.
1 3
2 6
□ 9
4 12
5 15
submit

Explanation:

Step1: Identify the ratio pattern

Notice that each right column value is 3 times the left column value: $3=1\times3$, $6=2\times3$, $12=4\times3$, $15=5\times3$.

Step2: Solve for the missing value

Let the missing value be $x$. Use the ratio: $9 = x\times3$, so $x=\frac{9}{3}$

Answer:

3