$46, 52, 60, 70, ?$

$1 : 8 :: 27 : ?$

Find the next number in the series: $9, 15, 27, 51, 99, ?$

$9, 19, 40, 83, ?, 345, 696$

If $A = \left(\frac{1}{0.4}\right) + \left(\frac{1}{0.04}\right) + \left(\frac{1}{0.004}\right) + \dots$ up to $8$ terms,then what is the value of $A$ (in $.5$)?

Find out the odd number from the given sequence.
$8424, 4212, 2106, 1051, 526.5, 263.25, 131.625$