Teaser 2855: Fab four

From The Sunday Times, 11th June 2017 [link] [link]

Here are four numbers, where each is the same fixed whole-number multiple of the previous one. However, in some places I have consistently replaced digits by letters — and in the other places the digits have been replaced by [asterisks]. In this way the numbers have become the fabulous four:

JOHN
P*UL
R***O
****GE

What number is my GROUP?

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