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Finding the Fourth Proportional to 138.12, 206.68 and 113.46

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Solution

The fourth proportional to 138.12, 206.68 and 113.46 is: 169.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.12 : 206.68 = 113.46 : x
  2. Step 2: Convert to fraction form
    138.12/206.68 = 113.46/x
  3. Step 3: Cross multiply
    138.12x = 206.68 × 113.46
  4. Step 4: Simplify right side
    138.12x = 23,449.91
  5. Step 5: Solve for x
    x = 23,449.91/138.12
  6. Step 6: Final answer
    x = 169.78

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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.