You can scale the image in ID, but the resolution will become lower. The resulting quality may or may not be suffient for your needs.
Check the effective ppi in the Links panel after scaling - it should ideally be 300 for standard commercial printing.
To proportionally scale the image, hold down Ctrl + Shift with the selection tool, and drag from a corner.
Alternatively, start over in Photoshop with a high resolution image, save a copy with the required dimensions at 300 ppi.