CLASS -7 Ratio & Proportion Part-2 , Comparing Ratio questions

If a line has direction ratios proportional to 2, -1, -2, then what are its direction cosines?

Are the ratio in proportion ? 60:88 and 180:264

Are the ratio in proportion ? 3 km to 9000 m and 6000 g to 4 kg

A ratio equivalent to 5:7 is

The relative lowering in vapour pressure is proportional to the ratio of number of

If three quantities are in continued proportion, show that the ratio of the first to the third is the duplicate ratio of the first to the second.

Divide 108 in two parts in the ratio 4: 5.

If the ratio of the concentration of electron to that of holes in a semiconductor is (7)/(5) and the ratio of current is (7)/(4) then what is the ratio of their drift velocities ?