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Finding the Fourth Proportional to 71.38, 98.58 and 63.61

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Solution

The fourth proportional to 71.38, 98.58 and 63.61 is: 87.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.38 : 98.58 = 63.61 : x
  2. Step 2: Convert to fraction form
    71.38/98.58 = 63.61/x
  3. Step 3: Cross multiply
    71.38x = 98.58 × 63.61
  4. Step 4: Simplify right side
    71.38x = 6,270.59
  5. Step 5: Solve for x
    x = 6,270.59/71.38
  6. Step 6: Final answer
    x = 87.85

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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.