The ratio of the radii of two circles A and B is 4:3, the circumference of circle B is 37.68 centimeters, how many centimeters is the circumference of circle A.
甲、乙两个圆的半径比是4：3，乙圆的周长是37.68厘米，甲圆的周长是多少厘米．
<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">37.68 * (4/3)</gadget>
<output>50.24</output>

<result>50.24</result>