Problem 30 - Re-using Ruby

I originally used Ruby on problem #4, and then recovered it...now I am using it for problem 30. Though I have not written a line of the language outside of Project Euler, I am starting to like it.

def sumDigiFifthPowers(x)
 ret = 0
 (1..(x.to_s.length)).each {|i|
 ret += ((x % (10 ** i)) / (10 ** (i - 1))) ** 5 }
 return ret
end

ans = 0
#upper bound is sumDigiFifthPowers(999999) as it is 5 digits
#nothing less than it can have the desired property
(100..354294).each {|num| 
 if num == sumDigiFifthPowers(num)
  ans += num
 end
} 
print ans