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Finding the Fourth Proportional to 87, 130.56 and 58.56

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Solution

The fourth proportional to 87, 130.56 and 58.56 is: 87.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    87 : 130.56 = 58.56 : x
  2. Step 2: Convert to fraction form
    87/130.56 = 58.56/x
  3. Step 3: Cross multiply
    87x = 130.56 × 58.56
  4. Step 4: Simplify right side
    87x = 7,645.59
  5. Step 5: Solve for x
    x = 7,645.59/87
  6. Step 6: Final answer
    x = 87.88

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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.