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Finding the Fourth Proportional to 149.85, 224.82 and 81.45

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Solution

The fourth proportional to 149.85, 224.82 and 81.45 is: 122.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.85 : 224.82 = 81.45 : x
  2. Step 2: Convert to fraction form
    149.85/224.82 = 81.45/x
  3. Step 3: Cross multiply
    149.85x = 224.82 × 81.45
  4. Step 4: Simplify right side
    149.85x = 18,311.59
  5. Step 5: Solve for x
    x = 18,311.59/149.85
  6. Step 6: Final answer
    x = 122.20

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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.