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Constant of proportionality from tables (with equations)

Problem

The quantities x and y are proportional.
xy
222
777
999
Find the constant of proportionality (r) in the equation y=rx.
r=
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
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