One of the best ways for you to get the required result is to use an effector.
First, make the voronoi fragments a child of a plan effector.
Under plan effector click on parameter tick out position, tick on the scale (take scale to -1 and tick uniform scale), go to falloff, click and select linear field.
Go back to the effector click one random, go to parameter change all positions to 10cm or a required size, click and select linear field.
Final step:
Click on the linear field (child of plain) and drag to the left-hand side
Do the same for the linear field (child of random) and place like an inch behind the first linear field (child of plain)