富三分之二四分之一是一个数学问题，涉及分数的乘法。在解决这个问题之前，让我们先来复习一下分数的基本知识。

分数由两部分组成，分子和分母。分子表示分数中的数量，而分母表示分数的单位。例如，1/2表示一个整体中的一半，其中1是分子，2是分母。

现在，让我们来解决这个问题。题目中的富三分之二指的是富人群体在总人口中所占的比例。而四分之一则表示中产阶级在总人口中的比例。

要计算富三分之二四分之一，我们需要将两个分数相乘。也就是说，我们需要将富三分之二的分数乘以四分之一的分数。让我们来进行计算。

首先，富三分之二可以表示为2/3，而四分之一可以表示为1/4。现在，我们将这两个分数相乘。分子相乘得到2×1=2，而分母相乘得到3×4=12。因此，富三分之二四分之一等于2/12。

现在，我们可以化简这个分数。通过找到分子和分母的最大公约数，我们可以将分数化简为最简形式。在这种情况下，2和12的最大公约数是2。将分子和分母都除以2，我们得到1/6。

所以，富三分之二四分之一等于1/6。这意味着富人群体在总人口中所占的比例乘以中产阶级在总人口中的比例等于1/6。

In English:

"Two-thirds of the wealthy multiplied by one-fourth of the middle class equals what?"

Two-thirds refers to the proportion of wealthy individuals in the total population. And one-fourth represents the proportion of the middle class in the total population.

To calculate two-thirds of the wealthy multiplied by one-fourth of the middle class, we need to multiply these two fractions. Let's proceed with the calculation.

Firstly, two-thirds can be represented as 2/3, and one-fourth can be represented as 1/4. Now, let's multiply these two fractions. The numerator multiplication gives us 2×1=2, and the denominator multiplication gives us 3×4=12. Therefore, two-thirds of the wealthy multiplied by one-fourth of the middle class equals 2/12.

Now, we can simplify this fraction. By finding the greatest common divisor of the numerator and denominator, we can reduce the fraction to its simplest form. In this case, the greatest common divisor of 2 and 12 is 2. Dividing both the numerator and denominator by 2, we get 1/6.

So, two-thirds of the wealthy multiplied by one-fourth of the middle class equals 1/6. This means that the proportion of the wealthy in the total population multiplied by the proportion of the middle class in the total population equals 1/6.