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Finding the Fourth Proportional to 179.12, 268.72 and 138.12

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Solution

The fourth proportional to 179.12, 268.72 and 138.12 is: 207.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.12 : 268.72 = 138.12 : x
  2. Step 2: Convert to fraction form
    179.12/268.72 = 138.12/x
  3. Step 3: Cross multiply
    179.12x = 268.72 × 138.12
  4. Step 4: Simplify right side
    179.12x = 37,115.61
  5. Step 5: Solve for x
    x = 37,115.61/179.12
  6. Step 6: Final answer
    x = 207.21

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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.