[ccmovrwc]

I was under the impression (ok, I assumed and never gave it much thought) that they were all equal parts.

Actually, although the idea that each successive Horcrux would contain a smaller and smaller portion of Voldemort's soul is gleefully logical, the book actually leads us to believe that each Horcrux contains an equal portion of the soul.

Dumbledore says, "However, a withered hand does not seem an unreasonable exchange for a seventh of Voldemort's soul. The ring is no longer a Horcrux." (see the bottom of page 503)

[WV Mountain Mama]

LOL, I wrote that quote to someone earlier about why/how DD's hand turned black. OY!