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jQuery: change css color based on inline style width
<div id="progress_bar" class="meter-bg">
        <div class="meter" style="width: 67%;">
        </div>
    </div>

var oMeter = $('.meter');
var percent = 100 * (oMeter.width() / $('#progress_bar').width());

if (percent < 33)
{
     oMeter.css('background-color', 'green');
}
else if (percent > 33 && percent <= 66)
{
     oMeter.css('background-color', 'orange');
}
else
{
     oMeter.css('background-color', 'red');
}

function setupMeter() {
    var oMeter = $('.meter');
    var percent = 100 * (oMeter.width() / oMeter.closest('.meter-bg').width());

    if (percent < 33) {
        oMeter.css('background-color', 'green');
    }
    else if (percent > 33 && percent <= 66) {
        oMeter.css('background-color', 'orange');
    }
    else {
        oMeter.css('background-color', 'red');
    }
}

// Example when loading from AJAX:
$.get("some_content.html", function(data) {
    $('#container').html(data);
    setupMeter();
});

var p = 74; // your percentage from someplace
var colors = ['one','two','three']; // names of your css classes
var chosen = colors[0];
i = 1;
while(i < colors.length) {
    var m = Math.round((i/colors.length) * 100);
    if(p > m){
        chosen = colors[i];
        i++;
        continue;
    }
    break;
}
console.log(chosen) // chosen now contains the array var you want depending on % p