Percentage-width divs followed by fixed width div

You'll have to mess with the paddings to fix the rest, but below is a working fiddle and the code. Sorry about the poor naming conventions, but you should be able to change all that to what you need.

http://jsfiddle.net/8HgHt/

.third {
  padding: 0;
  background-color: gray;
  height: 100px;
  float: left;
  display: table-cell;
  width: 33%;
}

.third:hover {
  background-color: red;
}

.third_holder {
  float: left;
  width: 100%;
  display: table-cell;
}

.absolute_div {
  width: 200px;
  display: table-cell;
  background-color: silver;
}

.whole_container {
  width: 100%;
  display: table;
}

<div class="whole_container">

  <div class="third_holder">
    <div class="third">
    </div>
    <div class="third">
    </div>
    <div class="third">
    </div>
  </div>

  <div class="absolute_div">
  </div>
</div>

You could use calc

Jsfiddle Demo

CSS

* {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box; /* accounting for borders */
}

.wrapper {
    width:80%; /* or any width */
    margin:10px auto; /* for visualisation purposes only */
    overflow:hidden; /* float containment */
}

.wrapper div {
    float:left;
    height:100px;
}

.fixed {
    width:200px;
    background: lightblue;
}

.percent {
    width:calc((100% - 200px)/3); /* the magic bit */
    background: lightgreen;
    border:1px solid grey;
}

Support IE9 & up - http://caniuse.com/calc