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Finding the Fourth Proportional to 137,910.36, 206,928.72 and 81,861.60

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Solution

The fourth proportional to 137,910.36, 206,928.72 and 81,861.60 is: 122,829.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,910.36 : 206,928.72 = 81,861.60 : x
  2. Step 2: Convert to fraction form
    137,910.36/206,928.72 = 81,861.60/x
  3. Step 3: Cross multiply
    137,910.36x = 206,928.72 × 81,861.60
  4. Step 4: Simplify right side
    137,910.36x = 16,939,516,105.15
  5. Step 5: Solve for x
    x = 16,939,516,105.15/137,910.36
  6. Step 6: Final answer
    x = 122,829.90

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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.