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Finding the Fourth Proportional to 87.42, 131.15 and 76.49

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Solution

The fourth proportional to 87.42, 131.15 and 76.49 is: 114.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.42 : 131.15 = 76.49 : x
  2. Step 2: Convert to fraction form
    87.42/131.15 = 76.49/x
  3. Step 3: Cross multiply
    87.42x = 131.15 × 76.49
  4. Step 4: Simplify right side
    87.42x = 10,031.20
  5. Step 5: Solve for x
    x = 10,031.20/87.42
  6. Step 6: Final answer
    x = 114.75

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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.