Running into a strange issue trying to arrange items that are placed in multiple rows, each row containing either 5 or 4 items (alternating 5 items, 4 items, 5 items, etc...). However, at 480px screen width, the layout switches simply to 2 items wide no matter how many in each row. This creates a layout issue between the 4-item rows and 5-item rows. When they're stacked on top of each other the rows with 4 work fine (2x2), but the rows of 5 have a hanging item/blank spot at the end of the box (2x2x1).
4/5 Row Layout:

2x2 row layout (with hanging item issue)

HTML:
<section id="rowArea">
   <div class="row fiveRow clearfix">
        <div class="rowItem"></div>
        <div class="rowItem"></div>
        <div class="rowItem"></div>
        <div class="rowItem"></div>
        <div class="rowItem"></div>
   </div>
   <div class="row fourRow clearfix">
        <div class="rowItem"></div>
        <div class="rowItem"></div>
        <div class="rowItem"></div>
        <div class="rowItem"></div>
   </div>
   <div class="row fiveRow clearfix">
        <div class="rowItem"></div>
        <div class="rowItem"></div>
        <div class="rowItem"></div>
        <div class="rowItem"></div>
        <div class="rowItem"></div>
   </div>
</section>
CSS:
/* Screen Width > 480px */
#rowArea {width:810px; height:auto; }
   .row {height:100px; }
   .fourRow {width:80%; padding:0 10%; }
      .fourRow .rowItem {width:25%; height:100px; float:left; }
   .fiveRow {width:90%; padding:0 5%; }
      .fiveRow .rowItem {width:20%; height:100px; float:left; }
/* Screen Width < 810px */
#rowArea {width:100%; height:auto; }
/* Screen Width < 480px */
#rowArea {width:100%; height:auto; }
   .row {height:100px; }
   .fourRow, .fiveRow {width:100%; padding:0 0; }
      .fourRow .rowItem, .fiveRow .rowItem {width:50%; height:100px; float:left; }
How do i restructure this/style this to eliminate the blank spot at the end of the 5-item rows? Any help is much appreciated!
 
     
    