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Finding the Fourth Proportional to 103.93, 155.72 and 81.05

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Solution

The fourth proportional to 103.93, 155.72 and 81.05 is: 121.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.93 : 155.72 = 81.05 : x
  2. Step 2: Convert to fraction form
    103.93/155.72 = 81.05/x
  3. Step 3: Cross multiply
    103.93x = 155.72 × 81.05
  4. Step 4: Simplify right side
    103.93x = 12,620.53
  5. Step 5: Solve for x
    x = 12,620.53/103.93
  6. Step 6: Final answer
    x = 121.44

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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.