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Finding the Fourth Proportional to 95.90, 131.63 and 87.69

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Solution

The fourth proportional to 95.90, 131.63 and 87.69 is: 120.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    95.90 : 131.63 = 87.69 : x
  2. Step 2: Convert to fraction form
    95.90/131.63 = 87.69/x
  3. Step 3: Cross multiply
    95.90x = 131.63 × 87.69
  4. Step 4: Simplify right side
    95.90x = 11,542.69
  5. Step 5: Solve for x
    x = 11,542.69/95.90
  6. Step 6: Final answer
    x = 120.37

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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.