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Finding the Fourth Proportional to 87.85, 131.76 and 53.83

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Solution

The fourth proportional to 87.85, 131.76 and 53.83 is: 80.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.85 : 131.76 = 53.83 : x
  2. Step 2: Convert to fraction form
    87.85/131.76 = 53.83/x
  3. Step 3: Cross multiply
    87.85x = 131.76 × 53.83
  4. Step 4: Simplify right side
    87.85x = 7,092.64
  5. Step 5: Solve for x
    x = 7,092.64/87.85
  6. Step 6: Final answer
    x = 80.74

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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.