Script to set width of table in Word

I have been trying to figure out how to set the width of a table in Word to 100%. The dictionary gives the terms ‘preferred width’ and ‘preferred width percent’. But I cannot work out how these are used. I have tried:

tell application "/Applications/Microsoft Word.app"
	set thisTable to selection
	set preferred width to preferred width percent
	set preferred width of thisTable to 100
end tell

but this doesn’t work. Any help would be really appreciated.

This code works:

tell application "Microsoft Word"
	set thisTable to table 1 of selection
	set preferred width type of thisTable to preferred width percent
	set preferred width of thisTable to 100
end tell

Thank you so much. Easy when you know the terminology!