I realise that the mathematics might look a little involved but, trust me, it's worth it.
16 / 9 = ?
OK maths time
16 / 9 = 1.777777 OK
320 / 200 = 1.6
1920 / 1200 = 1.6
1680 / 1050 = 1.6
1.6 as a fraction = 8/5 doubled up to make similar as above ratio = 16 / 10
So all my 16/9 monitor are 16/10. I've been miss sold monitors time to get my money back
Gaz