If the sequence is 205, 306, 427 then a possible 4th number is 568.
The initial difference between 205 and 306 is 101, which increases by 20 at each step.
306 → 427 = 121 : 427 → 568 = 141
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It could be: 2*214 = 428
18
The number which best completes the sequence below is 20 5 30 6 42 7
27.
The best choice for the next term after those shown is 75 .We have no way to know whether or not that will 'complete' the sequence.