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Finding the Fourth Proportional to 62.81, 86.11 and 62.71

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Solution

The fourth proportional to 62.81, 86.11 and 62.71 is: 85.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.81 : 86.11 = 62.71 : x
  2. Step 2: Convert to fraction form
    62.81/86.11 = 62.71/x
  3. Step 3: Cross multiply
    62.81x = 86.11 × 62.71
  4. Step 4: Simplify right side
    62.81x = 5,399.94
  5. Step 5: Solve for x
    x = 5,399.94/62.81
  6. Step 6: Final answer
    x = 85.97

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.