I was just looking Athletics Australia all time list for 400 and decided to see if I could find the top 20 400m runners, personal bests for 100 and 200. sources are AT rankings (all-time) and IAAF sites. The suggested times are calculated as follows.
200(1) = (400m Time - 3.5)/2
400 (2) = (200m time x 2) + 3.5
Suggest times
Rank Athlete 100 200 400 200 (1) 400 (2)
1 Darren Clark 10.47 20.49 44.38 20.44 44.48
2 Miles Murphy 20.59 44.71 20.605 44.68
3 Pat Dwyer 20.6 44.73 20.615 44.7
3 John Steffensen 20.79 44.73 20.615 45.08
4 Joel Milburn 10.85 21.41 44.8 20.65 46.32
5 Rick Mitchell 21.04 44.84 20.67 45.58
6 Ben Offereins 10.6 21 44.86 20.68 45.5
7 Robert Stone 20.44 44.98 20.74 44.38
8 Daniel Batman 10.19 20.44 45.02 20.76 44.38
9 Clinton Hill 45.06 20.78
10 Sean Wroe 10.52 20.97 45.07 20.785 45.44
11 Mark Garner 20.82 45.08 20.79 45.14
12 Paul Greene 10.48 20.94 45.16 20.83 45.38
13 Bruce Frayne 10.45 20.59 45.21 20.855 44.68
14 Casey Vincent 21.14 45.3 20.9 45.78
15 Chris Troode 10.69 21.41 45.42 20.96 46.32
16 Dean Capobianco 10.25 20.18 45.47 20.985 43.86
17 Brad Jamieson 21.45 45.5 21 46.4
18 Michael Rehardt 21.21 45.54 21.02 45.92
19 Declan Stack 45.55 21.025
20 Steve Solomon 45.58 21.04