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Finding the Fourth Proportional to 138.92, 206.82 and 138.24

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Solution

The fourth proportional to 138.92, 206.82 and 138.24 is: 205.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.92 : 206.82 = 138.24 : x
  2. Step 2: Convert to fraction form
    138.92/206.82 = 138.24/x
  3. Step 3: Cross multiply
    138.92x = 206.82 × 138.24
  4. Step 4: Simplify right side
    138.92x = 28,590.80
  5. Step 5: Solve for x
    x = 28,590.80/138.92
  6. Step 6: Final answer
    x = 205.81

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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.