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Finding the Fourth Proportional to 115.85, 173.69 and 38.78

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Solution

The fourth proportional to 115.85, 173.69 and 38.78 is: 58.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.85 : 173.69 = 38.78 : x
  2. Step 2: Convert to fraction form
    115.85/173.69 = 38.78/x
  3. Step 3: Cross multiply
    115.85x = 173.69 × 38.78
  4. Step 4: Simplify right side
    115.85x = 6,735.94
  5. Step 5: Solve for x
    x = 6,735.94/115.85
  6. Step 6: Final answer
    x = 58.15

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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.