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Finding the Fourth Proportional to 115.86, 173.55 and 87

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Solution

The fourth proportional to 115.86, 173.55 and 87 is: 130.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.86 : 173.55 = 87 : x
  2. Step 2: Convert to fraction form
    115.86/173.55 = 87/x
  3. Step 3: Cross multiply
    115.86x = 173.55 × 87
  4. Step 4: Simplify right side
    115.86x = 15,098.85
  5. Step 5: Solve for x
    x = 15,098.85/115.86
  6. Step 6: Final answer
    x = 130.32

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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.