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Finding the Fourth Proportional to 104.55, 156.41 and 81.46

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Solution

The fourth proportional to 104.55, 156.41 and 81.46 is: 121.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.55 : 156.41 = 81.46 : x
  2. Step 2: Convert to fraction form
    104.55/156.41 = 81.46/x
  3. Step 3: Cross multiply
    104.55x = 156.41 × 81.46
  4. Step 4: Simplify right side
    104.55x = 12,741.16
  5. Step 5: Solve for x
    x = 12,741.16/104.55
  6. Step 6: Final answer
    x = 121.87

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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.