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Finding the Fourth Proportional to 149.80, 224.47 and 81.30

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Solution

The fourth proportional to 149.80, 224.47 and 81.30 is: 121.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.80 : 224.47 = 81.30 : x
  2. Step 2: Convert to fraction form
    149.80/224.47 = 81.30/x
  3. Step 3: Cross multiply
    149.80x = 224.47 × 81.30
  4. Step 4: Simplify right side
    149.80x = 18,250.35
  5. Step 5: Solve for x
    x = 18,250.35/149.80
  6. Step 6: Final answer
    x = 121.83

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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.