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Finding the Fourth Proportional to 62.72, 86.08 and 61.76

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Solution

The fourth proportional to 62.72, 86.08 and 61.76 is: 84.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.72 : 86.08 = 61.76 : x
  2. Step 2: Convert to fraction form
    62.72/86.08 = 61.76/x
  3. Step 3: Cross multiply
    62.72x = 86.08 × 61.76
  4. Step 4: Simplify right side
    62.72x = 5,316.30
  5. Step 5: Solve for x
    x = 5,316.30/62.72
  6. Step 6: Final answer
    x = 84.76

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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.