Why do you think that is not the case? Intellisense would tell you there is no Width property. Recording a macro will give the syntax if needed. There is a difference between chart and plot area.
ActiveChart.ChartArea.Select
ActiveSheet.Shapes("Chart 1").ScaleWidth 1.0760456274, msoFalse, _
msoScaleFromTopLeft
ActiveSheet.Shapes("Chart 1").ScaleHeight 1.1590214067, msoFalse, _
msoScaleFromTopLeft
ActiveChart.PlotArea.Select
Selection.Width = 356.428
Selection.Height = 227.532
Try selecting the chart manually and then in the Immediate Window of the VBE, type: ActiveChart.
The period would open the intellisense options.