Home / 20,823.11-28,745.38-13,279.78

Finding the Fourth Proportional to 20,823.11, 28,745.38 and 13,279.78

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Solution

The fourth proportional to 20,823.11, 28,745.38 and 13,279.78 is: 18,332.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,823.11 : 28,745.38 = 13,279.78 : x
  2. Step 2: Convert to fraction form
    20,823.11/28,745.38 = 13,279.78/x
  3. Step 3: Cross multiply
    20,823.11x = 28,745.38 × 13,279.78
  4. Step 4: Simplify right side
    20,823.11x = 381,732,374.95
  5. Step 5: Solve for x
    x = 381,732,374.95/20,823.11
  6. Step 6: Final answer
    x = 18,332.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.