Math Problem Statement

solve

Solution

The problem states: "Three numbers are in the ratio 2:3:4. The sum of their cubes is 3391285. Find the numbers."

Let's denote the three numbers as 2x2x, 3x3x, and 4x4x respectively, where xx is a common factor.

Given: (2x)3+(3x)3+(4x)3=3391285(2x)^3 + (3x)^3 + (4x)^3 = 3391285

Now, let's calculate each term:

(2x)3=8x3(2x)^3 = 8x^3 (3x)3=27x3(3x)^3 = 27x^3 (4x)3=64x3(4x)^3 = 64x^3

So, the equation becomes: 8x3+27x3+64x3=33912858x^3 + 27x^3 + 64x^3 = 3391285

Combine the terms: 99x3=339128599x^3 = 3391285

Now, solve for x3x^3: x3=339128599=34255x^3 = \frac{3391285}{99} = 34255

Taking the cube root of both sides to find xx: x=34255332.9995x = \sqrt[3]{34255} \approx 32.9995

Since xx should be an integer, we'll approximate xx as 3333.

Thus, the numbers are: 2x=2×33=662x = 2 \times 33 = 66 3x=3×33=993x = 3 \times 33 = 99 4x=4×33=1324x = 4 \times 33 = 132

The three numbers are 66, 99, and 132.

Would you like more details or have any questions?

Here are some related questions:

  1. What is the general approach to solving ratio problems?
  2. How do you simplify cube roots when dealing with larger numbers?
  3. Can the same method be applied to different ratios, like 3:5:7?
  4. How do you verify the solution by recalculating the sum of the cubes?
  5. What if the ratio was a fraction, e.g., 12:32:52\frac{1}{2} : \frac{3}{2} : \frac{5}{2}?

Tip: When working with ratios, assigning a variable to represent the common factor helps in setting up equations to solve for unknowns effectively.

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Math Problem Analysis

Mathematical Concepts

Ratio
Cube
Equation solving

Formulas

Cube of a number (x^3)

Theorems

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Suitable Grade Level

High School