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Finding the Fourth Proportional to 87.75, 130.82 and 82.62

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Solution

The fourth proportional to 87.75, 130.82 and 82.62 is: 123.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.75 : 130.82 = 82.62 : x
  2. Step 2: Convert to fraction form
    87.75/130.82 = 82.62/x
  3. Step 3: Cross multiply
    87.75x = 130.82 × 82.62
  4. Step 4: Simplify right side
    87.75x = 10,807.94
  5. Step 5: Solve for x
    x = 10,807.94/87.75
  6. Step 6: Final answer
    x = 123.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.