Scale inserted videos with the correct aspect ratio in Adobe Premiere CC

When we insert a video clip into our timeline that has the same height, but different width than our project, Adobe Premiere CC distorts the inserted clip.

My project is 1920 x 1080, the inserted clip is 1440 x 1080. When I insert the narrower clip into my timeline, Adobe Premiere stretches the inserted clip horizontally.

To set the correct aspect ratio

1. Select the inserted clip in the timeline
   
2. In the upper left region select Effect Controls
3. Expand the Motion element
4. Uncheck the Uniform Scale checkbox
5. Set the Scale Width to the appropriate value, in my case it was 75% (1440 / 1920 )