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Finding the Fourth Proportional to 91,857.90, 137,592.45 and 72,029.10

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Solution

The fourth proportional to 91,857.90, 137,592.45 and 72,029.10 is: 107,891.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,857.90 : 137,592.45 = 72,029.10 : x
  2. Step 2: Convert to fraction form
    91,857.90/137,592.45 = 72,029.10/x
  3. Step 3: Cross multiply
    91,857.90x = 137,592.45 × 72,029.10
  4. Step 4: Simplify right side
    91,857.90x = 9,910,660,340.30
  5. Step 5: Solve for x
    x = 9,910,660,340.30/91,857.90
  6. Step 6: Final answer
    x = 107,891.21

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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.