Make a set of possible proportions from the numbers $15, 18, 35$ and $42$.

$42:35=18:15$

Is the following number is in continued proportion:

 $3, 6$ and $15$ 

Is the following number is in continued proportion:

 $15, 45$ and $48$ 

Is the following number is in continued proportion:

 $6, 12$ and $24$

Is the following number is in continued proportion:

 $12, 18$ and $27$