Home / 20,855.38-28,780.85-11,423.95

Finding the Fourth Proportional to 20,855.38, 28,780.85 and 11,423.95

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Solution

The fourth proportional to 20,855.38, 28,780.85 and 11,423.95 is: 15,765.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.38 : 28,780.85 = 11,423.95 : x
  2. Step 2: Convert to fraction form
    20,855.38/28,780.85 = 11,423.95/x
  3. Step 3: Cross multiply
    20,855.38x = 28,780.85 × 11,423.95
  4. Step 4: Simplify right side
    20,855.38x = 328,790,991.36
  5. Step 5: Solve for x
    x = 328,790,991.36/20,855.38
  6. Step 6: Final answer
    x = 15,765.28

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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.