Conditional Formatting for cells that are 50%<

I am trying to get conditional formation to highlight cells in column G that are 50% greater than the corresponding cell in column D. I have tied to use a formula to determine which cells to format with the formula below but it only works for one cell. I want to apply the formatting to all the cells in column G. Formula:=$G$39>=(0.5*$D$39)

Any recommendations?