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Finding the Fourth Proportional to 219.94, 330.12 and 138.54

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Solution

The fourth proportional to 219.94, 330.12 and 138.54 is: 207.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.94 : 330.12 = 138.54 : x
  2. Step 2: Convert to fraction form
    219.94/330.12 = 138.54/x
  3. Step 3: Cross multiply
    219.94x = 330.12 × 138.54
  4. Step 4: Simplify right side
    219.94x = 45,734.82
  5. Step 5: Solve for x
    x = 45,734.82/219.94
  6. Step 6: Final answer
    x = 207.94

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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.