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Finding the Fourth Proportional to 77.35, 115.80 and 41.20

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Solution

The fourth proportional to 77.35, 115.80 and 41.20 is: 61.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.35 : 115.80 = 41.20 : x
  2. Step 2: Convert to fraction form
    77.35/115.80 = 41.20/x
  3. Step 3: Cross multiply
    77.35x = 115.80 × 41.20
  4. Step 4: Simplify right side
    77.35x = 4,770.38
  5. Step 5: Solve for x
    x = 4,770.38/77.35
  6. Step 6: Final answer
    x = 61.68

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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.