One method you could use is to insert the image in a frame and it will adapt to the width of the frame. Add the 'Format Frame...' command to the QAT (Quick Access Toolbar) and use it to draw a frame the size you require.

Right click to format and choose whether you want a border or not. Then select it and either save it as an autotext building block or a formatted autocorrect entry. You can then insert the frame wherever you wish at the same size by calling the autotext or autocorrect and insert or paste your image into the frame.

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com