we know that
If two figures are similar, then the ratio of its corresponding sides is proportional
so
step 1
Verify the proportionality
Divide the lenght of corresponding sides
horizontal segments
3/6=1/2
scale factor is 1/2
so
Apply a translation 1 unit to the right and 1 unit down to quadrilateral 1 and then apply a dilation with a scale factor 1/2