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Finding the Fourth Proportional to 91,902.90, 137,672.10 and 80,943.60

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Solution

The fourth proportional to 91,902.90, 137,672.10 and 80,943.60 is: 121,254.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,902.90 : 137,672.10 = 80,943.60 : x
  2. Step 2: Convert to fraction form
    91,902.90/137,672.10 = 80,943.60/x
  3. Step 3: Cross multiply
    91,902.90x = 137,672.10 × 80,943.60
  4. Step 4: Simplify right side
    91,902.90x = 11,143,675,393.56
  5. Step 5: Solve for x
    x = 11,143,675,393.56/91,902.90
  6. Step 6: Final answer
    x = 121,254.88

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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.