It could be a 4 or even a 7. Who knows. I need more info.
91:100
91:9 (or 9:91)
182/10 = 91/5
21/91 = 3/13
11/13
91 octane 32-1 ratio
455/5 = 91/1 = 91
AS a product of its prime factors: 7*13 = 91
91 +
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The answer depends on which number is missing, and on the sequencing rule. Using cubic polynomials, if it the first, it is 107; if it is the second, 93.666... recurring; if it is the third, it is 88.333... recurring; and if it is the fourth, it is 91. Of course, the rule need not be polynomial!
71