But ratios aren't in the definition. From the wikipedia article:
"...a planet is a body that orbits the Sun, is massive enough for its own gravity to make it round, and has 'cleared its neighbourhood' of smaller objects around its orbit."
These three criteria define a planet and Pluto definitely meets the first two. As for the last, Pluto's perihelion is inside Neptune's orbit, thus (in my humble opinion) still clutters Neptune's orbital neighborhood.
I think the definition should have been chosen so as to expand the number of planets in the Solar System, possibly sparking a renewed interest in astronomy/space for the younger generations. Instead, the definition comes off as picayune and close-minded.