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Finding the Fourth Proportional to 115.41, 173.22 and 86.56

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Solution

The fourth proportional to 115.41, 173.22 and 86.56 is: 129.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.41 : 173.22 = 86.56 : x
  2. Step 2: Convert to fraction form
    115.41/173.22 = 86.56/x
  3. Step 3: Cross multiply
    115.41x = 173.22 × 86.56
  4. Step 4: Simplify right side
    115.41x = 14,993.92
  5. Step 5: Solve for x
    x = 14,993.92/115.41
  6. Step 6: Final answer
    x = 129.92

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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.