带div的HTML：

<div class="input-group input-group-lg">
  <label for="" class="control-label">Paycheck</label>
  <div class="col-lg-10">
    <span class="input-group-addon">$</span> 
    <input type="text" class="form-control" id="">
  </div>
</div>

如何设置输入元素的宽度以使它们完全相同？

我希望每个输入元素的左边距是这样的：

这就是现在的样子：

这是我目前的HTML：

<div class="col-md-6">
        <div class="content">
            <h2>Income</h2>
        <form class="form-income form-horizontal" role="form">
 
            <div class="input-group input-group-lg">
            <label for="" class="control-label">Paycheck</label>
                <span class="input-group-addon">$</span> 
                <input type="text" class="form-control" id="">
            </div>
 
            <div class="input-group input-group-lg">
            <label for="" class="control-label">Investments</label>
                <span class="input-group-addon">$</span>
                <input type="text" class="form-control" id=""> 
            </div>
 
            <div class="input-group input-group-lg">
            <label for="" class="control-label">Other</label>
                <span class="input-group-addon">$</span> 
                <input type="text" class="form-control" id="">
            </div>
 
            <button class="btn btn-lg btn-primary btn-block" type="submit">Update</button>
        </form>
 
        </div>

现场例子：http://jsfiddle.net/jfXUr/