Determine if 150, 200, 250, 300 are in proportion.

The correct answer is No

150:200 = $\dfrac{150}{200}$ = $\dfrac{3}{4}$

250:300 = $\dfrac{250}{300}$ = $\dfrac{5}{6}$

∴ 150:200 ≠ 250:300

Hence 150, 200, 250, 300 are not in proportion.