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Finding the Fourth Proportional to 62.97, 87.30 and 61.72

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Solution

The fourth proportional to 62.97, 87.30 and 61.72 is: 85.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.97 : 87.30 = 61.72 : x
  2. Step 2: Convert to fraction form
    62.97/87.30 = 61.72/x
  3. Step 3: Cross multiply
    62.97x = 87.30 × 61.72
  4. Step 4: Simplify right side
    62.97x = 5,387.41
  5. Step 5: Solve for x
    x = 5,387.41/62.97
  6. Step 6: Final answer
    x = 85.56

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.