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Finding the Fourth Proportional to 77.05, 106.33 and 42.55

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Solution

The fourth proportional to 77.05, 106.33 and 42.55 is: 58.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.05 : 106.33 = 42.55 : x
  2. Step 2: Convert to fraction form
    77.05/106.33 = 42.55/x
  3. Step 3: Cross multiply
    77.05x = 106.33 × 42.55
  4. Step 4: Simplify right side
    77.05x = 4,523.60
  5. Step 5: Solve for x
    x = 4,523.60/77.05
  6. Step 6: Final answer
    x = 58.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.