A healthy adult of height $1.7 \mathrm{m}$ has an average blood pressure (BP) of $100 \mathrm{mm}$ of $\mathrm{Hg}$. The heart is typically at a height of $1.3 \mathrm{m}$ from the foot. Take, the density of blood to be ${10}^3 \mathrm{kg}/{\mathrm{m}}^3$ and note that $100 \mathrm{mm}$ of $\mathrm{Hg}$ is equivalent to $13.3\mathrm{kPa}$ (kilo pascals). The ratio of BP in the foot region to that in the head region is close to