Better way to write methods that return methods based on a set of conditions in Ruby

I've run into a problem with the Cyclomatic complexity being too high for this ruby method:

def find_value(a, b, lookup_value)
  return find_x1(a, b) if lookup_value == 'x1'
  return find_x2(a, b) if lookup_value == 'x2'
  return find_x3(a, b) if lookup_value == 'x3'
  return find_x4(a, b) if lookup_value == 'x4'
  return find_x5(a, b) if lookup_value == 'x5'
  return find_x6(lookup_value) if lookup_value.include? 'test'
end

Is there any way of writing this without having to use eval?