In proportion, it is known that the product of two inner terms is 108, and one outer term is equal to 18, then what is the other outer term.
在比例里，已知两内项之积是108，一外项等于18，则另一外项是多少．
<gadget id="calculator">108 / 18</gadget>
<output>6</output>

<result>6</result>