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Finding the Fourth Proportional to 104.31, 156.32 and 81.38

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Solution

The fourth proportional to 104.31, 156.32 and 81.38 is: 121.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.31 : 156.32 = 81.38 : x
  2. Step 2: Convert to fraction form
    104.31/156.32 = 81.38/x
  3. Step 3: Cross multiply
    104.31x = 156.32 × 81.38
  4. Step 4: Simplify right side
    104.31x = 12,720.44
  5. Step 5: Solve for x
    x = 12,720.44/104.31
  6. Step 6: Final answer
    x = 121.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.