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Finding the Fourth Proportional to 104.13, 156.72 and 81.45

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Solution

The fourth proportional to 104.13, 156.72 and 81.45 is: 122.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.13 : 156.72 = 81.45 : x
  2. Step 2: Convert to fraction form
    104.13/156.72 = 81.45/x
  3. Step 3: Cross multiply
    104.13x = 156.72 × 81.45
  4. Step 4: Simplify right side
    104.13x = 12,764.84
  5. Step 5: Solve for x
    x = 12,764.84/104.13
  6. Step 6: Final answer
    x = 122.59

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.