连续比例 meaning in English

continuous proportion

Rule twenty - one - if there are many equations of this sort , they should all be reduced to a single one , viz . to the equation whose terms occupy fewer places in the series of magnitudes which are in continued proportion , i . e . the series in which the order of the terms is to be arranged
如果有同种类的许多等式，就应该化简到一个等式，也就是说，化简到在连续比例中量的系列里只有少数项，换言之，在此系列中，项目的秩序被安排好了。