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Finding the Fourth Proportional to 81,404.60, 122,106.90 and 61,446.20

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Solution

The fourth proportional to 81,404.60, 122,106.90 and 61,446.20 is: 92,169.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,404.60 : 122,106.90 = 61,446.20 : x
  2. Step 2: Convert to fraction form
    81,404.60/122,106.90 = 61,446.20/x
  3. Step 3: Cross multiply
    81,404.60x = 122,106.90 × 61,446.20
  4. Step 4: Simplify right side
    81,404.60x = 7,503,004,998.78
  5. Step 5: Solve for x
    x = 7,503,004,998.78/81,404.60
  6. Step 6: Final answer
    x = 92,169.30

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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.