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Finding the Fourth Proportional to 71,909.20, 107,863.80 and 21,989.29

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Solution

The fourth proportional to 71,909.20, 107,863.80 and 21,989.29 is: 32,983.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,909.20 : 107,863.80 = 21,989.29 : x
  2. Step 2: Convert to fraction form
    71,909.20/107,863.80 = 21,989.29/x
  3. Step 3: Cross multiply
    71,909.20x = 107,863.80 × 21,989.29
  4. Step 4: Simplify right side
    71,909.20x = 2,371,848,378.70
  5. Step 5: Solve for x
    x = 2,371,848,378.70/71,909.20
  6. Step 6: Final answer
    x = 32,983.94

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Similar ratio
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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.