Thank you for your reply.

I already tried the table approach, and this is what I did: I fixed the height, and I unchecked the box "Preferred Width" in the "Column" tab. But every time I uncheck it and open the table properties again, the box is checked.

When I insert the picture, two things can happen (all the pictures must have a 9cm height):
1- If the initial cell's width is greater than the image's width (with the defined height), the image is added with the desired height, but the table won't fit the width, so there will be blank space within the cell;
2- If the initial cell's width is smaller than the image's width, the image size will be reduced to fit the cell's width, also reducing its height, but the cell's height will stay as 9cm.

And I did it with the "Automatically resize to fit contents" box unchecked, when it is checked, it goes terribly wrong.

Is it possible to make it fit perfectly within the cell? Even though the image's aspect ratio is variable?