A patient suffering from a combination of emphysema and pulmonary fibrosis undergoes a clinical assessment of their lung function. Due to these conditions:

1. The total surface area of their alveoli is reduced by 40%.
2. The thickness of the alveolar-capillary membrane (diffusion pathway) is increased by 50%.
3. The partial pressure gradient of oxygen across the membrane is reduced by 20%.

According to Fick's Law of diffusion, what is the ratio of the rate of oxygen diffusion in this patient compared to that of a healthy individual?