Image quality in PDF files

Hi. I add images to pdf files all the time and I have a question about them. The image quality seems to be bad in certain situations. For example I added a 501x483 72dpi gif image to a 1190x1684 pdf file. It looks great at 75% zoom but really jagged at 100% zoom. Why is it like this? Shouldn't it be same as the original image file at 100% zoom?
I'd really appreciate any guidance about making images look better in pdf files.

Hi
Thanks for the  responses. I tried Print to PDF. In that images look better although they  are little distorted. However, I cannot use print because the Table of  Contents prepared in Word does not work when we use Print. Secondly, the  PDF file size becomes too large when using Print to PDF.
While  directly creating PDF from word using Acrobat, I changed settings for  Images (in Preferences) turning downsampling off after changing it to  1800 pixels but that did not help either. Is there anything I am missing  out or  Is there any other resolution?
Else is there any  setting in PDF so that after conversion we can show the images more  clearly, maybe if someone hovers over the image it becomes big or  clicking on it makes it look bigger.
Looking forward to make this problem resolve.
Thanks

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