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Finding the Fourth Proportional to 77.11, 115.66 and 38.59

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Solution

The fourth proportional to 77.11, 115.66 and 38.59 is: 57.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.11 : 115.66 = 38.59 : x
  2. Step 2: Convert to fraction form
    77.11/115.66 = 38.59/x
  3. Step 3: Cross multiply
    77.11x = 115.66 × 38.59
  4. Step 4: Simplify right side
    77.11x = 4,463.08
  5. Step 5: Solve for x
    x = 4,463.08/77.11
  6. Step 6: Final answer
    x = 57.88

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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.