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Finding the Fourth Proportional to 87.75, 131.36 and 64.85

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Solution

The fourth proportional to 87.75, 131.36 and 64.85 is: 97.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.75 : 131.36 = 64.85 : x
  2. Step 2: Convert to fraction form
    87.75/131.36 = 64.85/x
  3. Step 3: Cross multiply
    87.75x = 131.36 × 64.85
  4. Step 4: Simplify right side
    87.75x = 8,517.71
  5. Step 5: Solve for x
    x = 8,517.71/87.75
  6. Step 6: Final answer
    x = 97.07

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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.