Respiratory Therapy – Formulas Practice Test

If Ve = 400 mL and Vi = 3 × Ve, what is Vi?

1200 mL 120 mL 400 mL 800 mL

Correct Answer:

1200 mL

Explanation:

Vi is three times Ve. So multiply Ve by 3: 3 × 400 mL equals 1200 mL. This shows a simple proportional relationship where the inspired volume is a fixed multiple of the expiratory/tidal volume. The other numbers would come from using different multiples: 400 mL would just be Ve, not Vi; 800 mL would be 2 × Ve; 120 mL would be 0.3 × Ve.

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