I don't know how your report is set up, but can you use Multiple Mark Types? Can you post a tbwx?
One good way to do this would be to use Measure Names & Measure Values for 4 measures and Use the 5th measure on its own on the visualization. Like Alex mentions above, it depends a bit on the report that you are attempting to create. If this is a chart, you should be able to achieve the result using dual axis.
Hope it helps!
Thanks Alex and Siraj. Multiple Mark Types did the trick.