Custom cropping

I have an image in my iPhoto library that is 1000 pixels wide x 429 high. I would like to split it into four images, each representing 1/4 of the image, from left to right, i.e., each one would now be 250 wide x 429 high. I could do this "by eye" by making four duplicate images and estimating the location(s) of the vertical slice(s) I want to make. But is there a way to use the custom crop constraint so that the proportions remain in the proper ratio? (I guess I would still have to choose the places to slice by eye). There's an article in apple.com/support (ID TA27698, from June 2007, so maybe not up-to-date) about custom constraining -- it says that the custom constrain value is a ratio, not a specific pixel value; but the custom constraint control offers one setting at "1000", which does suggest accuracy to three significant figures.

Thank you for your prompt reply. The aspect of this problem that remains ambiguous to me is the actual usefulness of the dimensions I put in the boxes that appear when I click on custom. By this I mean that I can indeed type in the 250x429, but then nothing useful seems to happen -- if I hit "apply," I get a cropping that has nothing to do with the vertical shape of 250x429 that I just typed in.
If I merely uncheck the constrain box I can customize the crop area and keep any section of the image I want, without having gone to the trouble of setting the customized proportions (or actual dimensions). If I then hit "apply," I do get the crop I want (although I would like it to be precisely reproducible for the next three slices of the image). So this leaves me wondering about the actual use of iPhoto's invitation to customize my proportions. This is not intended as a criticism, because I could be wrong in my interpretation of what the custom constraint mode is designed to do, or how to get it to work. And I am aware that other software may be better suited to my needs. But I'd like to understand exactly what iPhoto is offering here.
Thanking you in advance...

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