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Finding the Fourth Proportional to 87.89, 131.88 and 33.78

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Solution

The fourth proportional to 87.89, 131.88 and 33.78 is: 50.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.89 : 131.88 = 33.78 : x
  2. Step 2: Convert to fraction form
    87.89/131.88 = 33.78/x
  3. Step 3: Cross multiply
    87.89x = 131.88 × 33.78
  4. Step 4: Simplify right side
    87.89x = 4,454.91
  5. Step 5: Solve for x
    x = 4,454.91/87.89
  6. Step 6: Final answer
    x = 50.69

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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.