Home / 20,859.23-31,279.49-12,429.71

Finding the Fourth Proportional to 20,859.23, 31,279.49 and 12,429.71

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Solution

The fourth proportional to 20,859.23, 31,279.49 and 12,429.71 is: 18,638.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,859.23 : 31,279.49 = 12,429.71 : x
  2. Step 2: Convert to fraction form
    20,859.23/31,279.49 = 12,429.71/x
  3. Step 3: Cross multiply
    20,859.23x = 31,279.49 × 12,429.71
  4. Step 4: Simplify right side
    20,859.23x = 388,794,771.10
  5. Step 5: Solve for x
    x = 388,794,771.10/20,859.23
  6. Step 6: Final answer
    x = 18,638.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.