During the summer vacation, the school plans to pave the corridor with square bricks. If square bricks with a side length of 3 decimeters are used, 480 pieces are needed; if square bricks with a side length of 4 decimeters are used, how many pieces are needed at least? (Solve with ratio)
暑假期间，学校准备用方砖铺走廊．如果用边长3分米的方砖，需要480块；如果用边长是4分米的方砖，则至少需要多少块？(用比例解)
<gadget id="calculator">3 * 3 * 480</gadget>
<output>4_320</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">4_320 / 16</gadget>
<output>270</output>

<result>270</result>