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Finding the Fourth Proportional to 71,353.29, 107,021.43 and 18,766.87

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Solution

The fourth proportional to 71,353.29, 107,021.43 and 18,766.87 is: 28,148.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,353.29 : 107,021.43 = 18,766.87 : x
  2. Step 2: Convert to fraction form
    71,353.29/107,021.43 = 18,766.87/x
  3. Step 3: Cross multiply
    71,353.29x = 107,021.43 × 18,766.87
  4. Step 4: Simplify right side
    71,353.29x = 2,008,457,545.68
  5. Step 5: Solve for x
    x = 2,008,457,545.68/71,353.29
  6. Step 6: Final answer
    x = 28,148.07

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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.