What you need is to have everything resized by the same proportion, in other words 740/680. Unfortunately that is not a nice number, and Illy only does one number at a time, so you may select all and either:
Object>Transform>Scale and insert 7400/68 as Unifrom Scale %, or:
1) In the transform palette, multiply the W (or) H value by 0.74 and Ctrl/CmdClick to preserve proportions;
2) In the transform palette, divide the W (or) H value by 0.68 and Ctrl/CmdClick to preserve proportions.
A is easier.
The closest you can probably come with AI is 108.8236% which is 740.00048.
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Select the items you want to scale.
DoubleClick the Scale Tool.
In the Scale Dialog's Uniform field, enter [desired size of known object]/[current size of known object].
Click outside the field, but not outside the dialog, to commit the field and make it do the math.
Move the decimal two positions rightward. Click OK.
Probably mentioned, there's a "Transform Each" command as well, so they don't move in relation to each other.
Thanks for your help everyone.
For my part you are welcome, Martin.
Applied to a length of 10,000pt, the result should be 10.882.353pt.
Done according to A) in the first post or to post #3, which is basically the same, the result is 10,882.354pt
Done according to B in the first post, the result is 10,882.354pt
Done according to post #2, the result is 10,882.359pt