Adults = 50% of passengers, so Children = 50%.
Girls = \( \frac{3}{4} \) of boys, so Boys : Girls = 4 : 3.

• Children fraction = 7 parts = 50%
• Adults must be 7 parts as well (50% = 50%).
• Ratio Boys : Girls : Adults = 4 : 3 : 7

Final Answer: 4 : 3 : 7