If you give the table cells a fixed row height and column width (which even a macro would require), the inserted images should rescale to fit the available space at the correct aspect ratio.

In your screenshot, it appears one cell is to contain three images. You should split that cell into three, using whatever configuration is appropriate, so each image has its own cell to constrain its dimensions.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]