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Finding the Fourth Proportional to 20,861.80, 28,789.02 and 11,301.52

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Solution

The fourth proportional to 20,861.80, 28,789.02 and 11,301.52 is: 15,595.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.80 : 28,789.02 = 11,301.52 : x
  2. Step 2: Convert to fraction form
    20,861.80/28,789.02 = 11,301.52/x
  3. Step 3: Cross multiply
    20,861.80x = 28,789.02 × 11,301.52
  4. Step 4: Simplify right side
    20,861.80x = 325,359,685.31
  5. Step 5: Solve for x
    x = 325,359,685.31/20,861.80
  6. Step 6: Final answer
    x = 15,595.95

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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.