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Finding the Fourth Proportional to 87,985.60, 131,978.40 and 82,916.80

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Solution

The fourth proportional to 87,985.60, 131,978.40 and 82,916.80 is: 124,375.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,985.60 : 131,978.40 = 82,916.80 : x
  2. Step 2: Convert to fraction form
    87,985.60/131,978.40 = 82,916.80/x
  3. Step 3: Cross multiply
    87,985.60x = 131,978.40 × 82,916.80
  4. Step 4: Simplify right side
    87,985.60x = 10,943,226,597.12
  5. Step 5: Solve for x
    x = 10,943,226,597.12/87,985.60
  6. Step 6: Final answer
    x = 124,375.20

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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.