Highlight column D.

Format/Conditional Formatting

Cell Value is: equal to: 1
Format Patterns Blue

Add

Cell Value is: greater than or equal to: .9
Format Patterns Green

Add
Cell Value is: greater than or equal to: 0
Format Patterns Red

"Merv" wrote:

Automating the result cell to show different colors based on answer of
formula cell. I.E. D1 is result of B1/C1. D1=100% Blue fill; 90% to 99% Green
fill; less than 90% Red fill. This is a corporate dashboard.