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Finding the Fourth Proportional to 148.20, 221.13 and 126.44

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Solution

The fourth proportional to 148.20, 221.13 and 126.44 is: 188.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.20 : 221.13 = 126.44 : x
  2. Step 2: Convert to fraction form
    148.20/221.13 = 126.44/x
  3. Step 3: Cross multiply
    148.20x = 221.13 × 126.44
  4. Step 4: Simplify right side
    148.20x = 27,959.68
  5. Step 5: Solve for x
    x = 27,959.68/148.20
  6. Step 6: Final answer
    x = 188.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.