[aboutruby]

In ruby you need to use bigdecimal:

    precision = Float::DIG + 1
    require 'bigdecimal'
    a = BigDecimal(8.98846567431158e+307, precision)
    b = BigDecimal(8.988465674311579e+307, precision)
    mean = (a + b) / 2
    puts "Works" if mean > [a, b].min && mean < [a, b].max
    => Works

(edit: I used 0 first and it works fine but converts to precision 15 instead of 16 (which is the maximum on my computer) for some reason, I may file a bug for this)

Works for small floats too:

    smalls = [1.390671161567e-309, 1.390671161567e-309, 1.390671161567e-309].map { BigDecimal(@1, precision) }
    mean = smalls.sum / smalls.size
    puts "Works" if mean >= smalls.min && mean <= smalls.max
    => Works

One could also use BigDecimal("8.98846567431158e+307") but seems like the numbers are coming as floats.