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Finding the Fourth Proportional to 104.27, 156.47 and 81.49

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Solution

The fourth proportional to 104.27, 156.47 and 81.49 is: 122.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.27 : 156.47 = 81.49 : x
  2. Step 2: Convert to fraction form
    104.27/156.47 = 81.49/x
  3. Step 3: Cross multiply
    104.27x = 156.47 × 81.49
  4. Step 4: Simplify right side
    104.27x = 12,750.55
  5. Step 5: Solve for x
    x = 12,750.55/104.27
  6. Step 6: Final answer
    x = 122.28

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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.