After selecting an object (object: A table, chart, graphic, equation, or other form of information. Objects created in one application, for example spreadsheets, and linked or embedded in another application are OLE objects.), maybe a picture or a text box, you have a number of options for resizing the object.
Note You can override the settings to snap to ruler marks, guides, and objects by holding down ALT while you drag the mouse.
Note To change the proportions but keep the original aspect ratio, select the Lock aspect ratio check box. When this box is selected any change you make to the height will cause the width to change, and vice-versa, to maintain the aspect ratio.