In the ratio, the two outer terms are reciprocals of each other, one of the inner terms is 38, and the other inner term is how much.
在比例里两个外项互为倒数，其中一个内项是38，另一个内项是多少．
<gadget id="calculator">1 / 38</gadget>
<output>1/38 = around 0.026316</output>

<result>1/38 = around 0.026316</result>