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Finding the Fourth Proportional to 28,887, 39,861.90 and 16,311.48

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Solution

The fourth proportional to 28,887, 39,861.90 and 16,311.48 is: 22,508.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,887 : 39,861.90 = 16,311.48 : x
  2. Step 2: Convert to fraction form
    28,887/39,861.90 = 16,311.48/x
  3. Step 3: Cross multiply
    28,887x = 39,861.90 × 16,311.48
  4. Step 4: Simplify right side
    28,887x = 650,206,584.61
  5. Step 5: Solve for x
    x = 650,206,584.61/28,887
  6. Step 6: Final answer
    x = 22,508.62

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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.