A car travels $165\mathrm{km}$ in $3$$\mathrm{hours}$.   How far will it travel in $6\frac{1}{2}$$\mathrm{hours}$.

$36:81=28:63$

$150:100=135:90$

$30:40=45:60$

$81 \mathrm{kg}:45 \mathrm{kg}=18 \mathrm{men}:10 \mathrm{men}$

Find whether of the following are in proportion:

$8, 16 , 6, 12$

Find whether the following are in proportion:

$150, 200, 250, 300$

Find whether the following are in proportion:

$100, 50, 75, 150$

Find whether the following are in proportion:

$49, 69, 69, 46$