I totally agree with Peru Bob's advice to use the rectangular marquee tool followed by Edit > Crop.
I also frequently use another non destructive cropping solution, it's by using the 'Edit in camera raw' option.
- Click on the Edit icon until a drop down menu is displayed.
- Choose 'custom' and enter your ratio: 1 and 1.5
- Adjust your crop rectangle.
- You can even tilt the rectangle (which is not possible with the rectangular marquee tool).
- Your ratio is 'sticky'.
- You can apply it to a batch of files opened in ACR and adjust it individually for position or tilt until you save all your files.
- You finish either by
* select all and click 'Done'. This will save the edit settings without losing the original image.
* or select all, clicking 'open' to open the files in the editor for further editing, saving and printing.
Of course, there are other advantages with using 'open in ACR', like applying the same settings to a batch of images and saving the edits non destructively.