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Finding the Fourth Proportional to 87.82, 120.69 and 75.44

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Solution

The fourth proportional to 87.82, 120.69 and 75.44 is: 103.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.82 : 120.69 = 75.44 : x
  2. Step 2: Convert to fraction form
    87.82/120.69 = 75.44/x
  3. Step 3: Cross multiply
    87.82x = 120.69 × 75.44
  4. Step 4: Simplify right side
    87.82x = 9,104.85
  5. Step 5: Solve for x
    x = 9,104.85/87.82
  6. Step 6: Final answer
    x = 103.68

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.