Given that the area ratio of an isosceles triangle of equal height to a parallelogram is 3:8, find the ratio of the base of the triangle to the base of the parallelogram.
已知等高一等腰三角形与一平行四边形的面积比是3：8，求该三角形底边与该平行四边形底边的比值．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">6 / 8</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>