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Finding the Fourth Proportional to 29,138.80, 40,211.49 and 16,391.99

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Solution

The fourth proportional to 29,138.80, 40,211.49 and 16,391.99 is: 22,620.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,138.80 : 40,211.49 = 16,391.99 : x
  2. Step 2: Convert to fraction form
    29,138.80/40,211.49 = 16,391.99/x
  3. Step 3: Cross multiply
    29,138.80x = 40,211.49 × 16,391.99
  4. Step 4: Simplify right side
    29,138.80x = 659,146,381.02
  5. Step 5: Solve for x
    x = 659,146,381.02/29,138.80
  6. Step 6: Final answer
    x = 22,620.92

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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.