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Finding the Fourth Proportional to 104.01, 156.09 and 81.06

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Solution

The fourth proportional to 104.01, 156.09 and 81.06 is: 121.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.01 : 156.09 = 81.06 : x
  2. Step 2: Convert to fraction form
    104.01/156.09 = 81.06/x
  3. Step 3: Cross multiply
    104.01x = 156.09 × 81.06
  4. Step 4: Simplify right side
    104.01x = 12,652.66
  5. Step 5: Solve for x
    x = 12,652.66/104.01
  6. Step 6: Final answer
    x = 121.65

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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.