To Set the Active Scale Factors Graphically

Key in ACTIVE SCALE DISTANCE.
Enter a data point to define a known location or keypoint.
Enter a data point to define a second known location or keypoint.
Enter a data point to define the active scale factors.
The active scale factors are computed by dividing the distance between the first and third points by the distance between the first and second points and are displayed in the Status Bar.

Active Scale by 3 Points. Top: Setting active scale factors to 1.5. Bottom: Setting Active Scale factors to 0.5.