Figure 1 shows the volumes of:
which completely react to produce different masses of lead(II) iodide precipitate.

Determine the simplest whole number ratio of the volumes of:
potassium iodide solution:lead(II) nitrate solution\text{potassium iodide solution} : \text{lead(II) nitrate solution}potassium iodide solution:lead(II) nitrate solution
which completely react with each other. Use Figure 1.