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Finding the Fourth Proportional to 61.92, 84.81 and 61.72

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Solution

The fourth proportional to 61.92, 84.81 and 61.72 is: 84.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.92 : 84.81 = 61.72 : x
  2. Step 2: Convert to fraction form
    61.92/84.81 = 61.72/x
  3. Step 3: Cross multiply
    61.92x = 84.81 × 61.72
  4. Step 4: Simplify right side
    61.92x = 5,234.47
  5. Step 5: Solve for x
    x = 5,234.47/61.92
  6. Step 6: Final answer
    x = 84.54

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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.