Which of the following shows a proportion?

eight over eighteen equals twelve over twenty-seven

three over eight equals ten over fifteen

six over four equals eight over twelve

twelve over twenty equals ten over eighteen

Question

Which of the following shows a proportion?

eight over eighteen equals twelve over twenty-seven

three over eight equals ten over fifteen

six over four equals eight over twelve

twelve over twenty equals ten over eighteen

texaschic101 · Answer

8/18 = 12/27 (cross multiply)
(8)(27) = (18)(12)
216 = 216 (correct) -- this is a proportion

3/8 = 10/15 (cross multiply)
(3)(15) = (8)(10)
45 = 80 (incorrect) -- this is not a proportion

If the final result is equal, then it is a proportion. If they are not equal, then it is not a proportion.