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Finding the Fourth Proportional to 100.08, 149.91 and 81.85

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Solution

The fourth proportional to 100.08, 149.91 and 81.85 is: 122.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.08 : 149.91 = 81.85 : x
  2. Step 2: Convert to fraction form
    100.08/149.91 = 81.85/x
  3. Step 3: Cross multiply
    100.08x = 149.91 × 81.85
  4. Step 4: Simplify right side
    100.08x = 12,270.13
  5. Step 5: Solve for x
    x = 12,270.13/100.08
  6. Step 6: Final answer
    x = 122.60

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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.