e.g. 
@nums = ('0.0989999999999', '0.6799999999999', '0.0859999999999', '0.0239999999999');

@short_nums = ('0.099', '0.68', '0.086', '0.024');


@found = ('0.099', '0.086');


if (defined ($found[0]))   {
     for (my $i =0; $i<@short_nums; $i++)  {

              if ($found[0] == $short_nums[$i])   {
                    push @new_array,  $nums[$i];
              }
     }
}

# etc ....