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Finding the Fourth Proportional to 62.97, 86.86 and 39.64

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Solution

The fourth proportional to 62.97, 86.86 and 39.64 is: 54.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.97 : 86.86 = 39.64 : x
  2. Step 2: Convert to fraction form
    62.97/86.86 = 39.64/x
  3. Step 3: Cross multiply
    62.97x = 86.86 × 39.64
  4. Step 4: Simplify right side
    62.97x = 3,443.24
  5. Step 5: Solve for x
    x = 3,443.24/62.97
  6. Step 6: Final answer
    x = 54.68

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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.