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Finding the Fourth Proportional to 137,076.60, 205,614.90 and 81,780.60

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Solution

The fourth proportional to 137,076.60, 205,614.90 and 81,780.60 is: 122,670.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,076.60 : 205,614.90 = 81,780.60 : x
  2. Step 2: Convert to fraction form
    137,076.60/205,614.90 = 81,780.60/x
  3. Step 3: Cross multiply
    137,076.60x = 205,614.90 × 81,780.60
  4. Step 4: Simplify right side
    137,076.60x = 16,815,309,890.94
  5. Step 5: Solve for x
    x = 16,815,309,890.94/137,076.60
  6. Step 6: Final answer
    x = 122,670.90

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1.5x scale

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.