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Finding the Fourth Proportional to 12,489.20, 18,712.20 and 10,545.20

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Solution

The fourth proportional to 12,489.20, 18,712.20 and 10,545.20 is: 15,799.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.20 : 18,712.20 = 10,545.20 : x
  2. Step 2: Convert to fraction form
    12,489.20/18,712.20 = 10,545.20/x
  3. Step 3: Cross multiply
    12,489.20x = 18,712.20 × 10,545.20
  4. Step 4: Simplify right side
    12,489.20x = 197,323,891.44
  5. Step 5: Solve for x
    x = 197,323,891.44/12,489.20
  6. Step 6: Final answer
    x = 15,799.56

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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.