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Finding the Fourth Proportional to 91,898.90, 137,666.10 and 80,939.60

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Solution

The fourth proportional to 91,898.90, 137,666.10 and 80,939.60 is: 121,248.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,898.90 : 137,666.10 = 80,939.60 : x
  2. Step 2: Convert to fraction form
    91,898.90/137,666.10 = 80,939.60/x
  3. Step 3: Cross multiply
    91,898.90x = 137,666.10 × 80,939.60
  4. Step 4: Simplify right side
    91,898.90x = 11,142,639,067.56
  5. Step 5: Solve for x
    x = 11,142,639,067.56/91,898.90
  6. Step 6: Final answer
    x = 121,248.88

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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.