Such a mathematical square matrix can be used to solve some mathematical problems, such as the simplest proportion problem, that is, to find the value of the third proportion according to the given two proportions. If the three ratios are A: B, B: C and C: D, then put a:b, b:c, c:d and D into each row of a 3-horizontal and 4-vertical square, and you can get the value of the third ratio.
In addition, the mathematical three-horizontal and four-vertical square matrix can also be used to solve some other mathematical problems, such as finding two roots of a quadratic equation, as long as the unknowns A, B and C and the results X, Y and Z are placed in each row of the three-horizontal and four-vertical square matrix respectively.
In a word, the three-horizontal and four-vertical square matrix in mathematics is a very useful mathematical tool, which can be used to solve some mathematical problems, such as finding the simplest proportion problem, finding the roots of a quadratic equation with one variable and so on.