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Finding the Fourth Proportional to 61.11, 84.18 and 42.69

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Solution

The fourth proportional to 61.11, 84.18 and 42.69 is: 58.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.11 : 84.18 = 42.69 : x
  2. Step 2: Convert to fraction form
    61.11/84.18 = 42.69/x
  3. Step 3: Cross multiply
    61.11x = 84.18 × 42.69
  4. Step 4: Simplify right side
    61.11x = 3,593.64
  5. Step 5: Solve for x
    x = 3,593.64/61.11
  6. Step 6: Final answer
    x = 58.81

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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.