Help: Constant scalaing speed across several clips.

Senior moment again, I'm afraid.
I have a sequence containing many single talking heads to camera. These vary in length from 4 seconds to 30 seconds.
I want to pull into each clip at the same speed. Naturally, because they all vary in length, they will not all end on the same percentage scale-up - so setting the outpoint of each clip to, say, 110% will not work, as a shorter clip will move faster than a longer one..
I have applied scale keyframes so that each clip begins at 100%. I want to set the outpoint percentage so that each clip scales up at the same speed/velocity.
Without using trial and error (of which there are too many clips to realistically do this), can anyone please tell me how to go about setting the clip scale using speed/velocity as the criteria, not percentage. I cannot see how to make use of the graph to acheive this.
Thanks in advance.

Ok... as I was figuring this out, I'm thinking that maybe you're overthinking the math a little bit. There are two solutions.
First, if, as I originally understood your needs, you want to shave the same amount of time off each clip, simply take your first clip, write down the beginning time, take it to 110%, write down the ending time, and figure out how many frames you chopped off. Then simply take your other clips, write down their beginning times, shave off the same number of frames, and you'll get an ending time. Then you can either run a math macro on it in a program like Excel to figure out what the percentage would be, or right click on the clip in the timeline, go to "speed and duration" and there you can manually enter a frame value for what you want the clip to be. (NOTE: if you're doing a math macro on it in Excel, figure your frames as if you had footage that was 100fps, not 30 or 60... Excel doesn't know how to break 30 at 100, if you get my drift).
Now, as I was thinking this through, it occured to me, that you might be way overthinking this. A percentage is a measurement of the whole. So if you had subtract 10% from a clip of 10 seconds, you've got a clip at 9 seconds. However, if you've got a clip at 20 seconds and you subtract 10%, you're not subtracting 1, but 2, leaving you with 18 seconds. So the rate at which end up with your clips is the same, when working with percentages. Make sense? So you might just simply need to speed each clip up by the same rate (percentage) and you'll get what you're looking for.
Does this help, or have I missed your goal?

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Help: Constant scalaing speed across several clips.

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