In a sequence of positive numbers,the ratio of each term to

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In a sequence of positive numbers,the ratio of each term to the term immediately following it is 1 to 3.What is the ratio of the 4th term in this sequence to the 7th term?
A,1 to 3
B,1 to 6
C,1 to 9
D,1 to 27
E,1 to 243
英语看不懂求翻译,看不懂所以不会做求详解~

题目大意是：一个正数列,每一项是后一项的三分之一
求第四项和第七项的比例是多少
很显然答案是(1/3)^(7-4) = 1:3^3=1:27
所以答案是D

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