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Finding the Fourth Proportional to 87.98, 131.81 and 57.49

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Solution

The fourth proportional to 87.98, 131.81 and 57.49 is: 86.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.98 : 131.81 = 57.49 : x
  2. Step 2: Convert to fraction form
    87.98/131.81 = 57.49/x
  3. Step 3: Cross multiply
    87.98x = 131.81 × 57.49
  4. Step 4: Simplify right side
    87.98x = 7,577.14
  5. Step 5: Solve for x
    x = 7,577.14/87.98
  6. Step 6: Final answer
    x = 86.12

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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.