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Finding the Fourth Proportional to 87.91, 131.67 and 85.03

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Solution

The fourth proportional to 87.91, 131.67 and 85.03 is: 127.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.91 : 131.67 = 85.03 : x
  2. Step 2: Convert to fraction form
    87.91/131.67 = 85.03/x
  3. Step 3: Cross multiply
    87.91x = 131.67 × 85.03
  4. Step 4: Simplify right side
    87.91x = 11,195.90
  5. Step 5: Solve for x
    x = 11,195.90/87.91
  6. Step 6: Final answer
    x = 127.36

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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.