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Finding the Fourth Proportional to 87.76, 131.81 and 53.59

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Solution

The fourth proportional to 87.76, 131.81 and 53.59 is: 80.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.76 : 131.81 = 53.59 : x
  2. Step 2: Convert to fraction form
    87.76/131.81 = 53.59/x
  3. Step 3: Cross multiply
    87.76x = 131.81 × 53.59
  4. Step 4: Simplify right side
    87.76x = 7,063.70
  5. Step 5: Solve for x
    x = 7,063.70/87.76
  6. Step 6: Final answer
    x = 80.49

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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.