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Finding the Fourth Proportional to 138.20, 206.24 and 107.60

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Solution

The fourth proportional to 138.20, 206.24 and 107.60 is: 160.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.20 : 206.24 = 107.60 : x
  2. Step 2: Convert to fraction form
    138.20/206.24 = 107.60/x
  3. Step 3: Cross multiply
    138.20x = 206.24 × 107.60
  4. Step 4: Simplify right side
    138.20x = 22,191.42
  5. Step 5: Solve for x
    x = 22,191.42/138.20
  6. Step 6: Final answer
    x = 160.57

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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.