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Finding the Fourth Proportional to 87,281.88, 120,375.90 and 53,689.56

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Solution

The fourth proportional to 87,281.88, 120,375.90 and 53,689.56 is: 74,046.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,281.88 : 120,375.90 = 53,689.56 : x
  2. Step 2: Convert to fraction form
    87,281.88/120,375.90 = 53,689.56/x
  3. Step 3: Cross multiply
    87,281.88x = 120,375.90 × 53,689.56
  4. Step 4: Simplify right side
    87,281.88x = 6,462,929,105.60
  5. Step 5: Solve for x
    x = 6,462,929,105.60/87,281.88
  6. Step 6: Final answer
    x = 74,046.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.