The ratio on the left side of the equal sign is 1.2:x, and the front and back terms of the ratio on the right side of the equal sign are 4.8 and 7.2 respectively. Find the value of x.
等号左边的比是1.2：x，等号右端的比的前项和后项分别是4.8和7.2，求x是多少．
<gadget id="calculator">1.2 * 7.2</gadget>
<output>8.64</output>

<gadget id="calculator">8.64 / 4.8</gadget>
<output>1.8</output>

<result>1.8</result>