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Finding the Fourth Proportional to 179.46, 268.11 and 138.78

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Solution

The fourth proportional to 179.46, 268.11 and 138.78 is: 207.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.46 : 268.11 = 138.78 : x
  2. Step 2: Convert to fraction form
    179.46/268.11 = 138.78/x
  3. Step 3: Cross multiply
    179.46x = 268.11 × 138.78
  4. Step 4: Simplify right side
    179.46x = 37,208.31
  5. Step 5: Solve for x
    x = 37,208.31/179.46
  6. Step 6: Final answer
    x = 207.33

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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.