for i in ORA:
    for j in ARA:
        if 0.99916667 < float(i)/float(j) < 1.0008333:
            print(float(i)/float(j))


where a small chunk of ARA looks like
51.474396
51.47522
51.480166
51.488557
51.492443
51.493931
51.503324
51.508048
51.511707
51.514793
51.517499
51.519927
51.52039
51.524113
51.524519
51.531245
51.533312
51.535475
51.5373
51.537758
51.538757
51.542488
51.538245
51.543475
51.544861
51.547767
51.549258
51.550137
51.552498
51.558267
51.558754
51.56142
51.56295
51.564619
51.564793
51.566104
51.568128
51.569824
51.572525
51.576248
51.572876
51.57413
51.575023
51.578267
51.578649
51.578786
51.57894
51.584605
51.584945
51.585838
51.586972
51.58932
51.589959
51.591029
51.591919

and a small chunk of ORA looks like
53.683875
53.72333333
54.04629167
54.03066667
53.64625
53.62308333
53.42341667
54.94216667
54.68233333
55.06691667
55.18645833
55.13641667
55.00779167
54.97225
55.33966667
52.42725
51.999875
52.360375
52.20916667
54.07383333
54.65079167
54.34991667
54.49166667
54.395
54.55970833
54.11429167
54.55429167
51.50979167
51.79579167
51.68329167
51.51675
51.76508333
55.34416667
54.594875
54.95116667
54.94079167
54.54479167
54.58058333
54.64916667
54.345375
54.80395833
54.26779167
54.913875
54.33575
54.41041667
54.41616667
54.72095833
54.85183333
54.84804167
53.35225
53.883125
53.50295833
53.855125
53.56404167
53.856
53.720375
53.50745833
53.91641667
53.39966667
53.89129167
55.234875