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Finding the Fourth Proportional to 138.36, 207.74 and 137.55

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Solution

The fourth proportional to 138.36, 207.74 and 137.55 is: 206.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.36 : 207.74 = 137.55 : x
  2. Step 2: Convert to fraction form
    138.36/207.74 = 137.55/x
  3. Step 3: Cross multiply
    138.36x = 207.74 × 137.55
  4. Step 4: Simplify right side
    138.36x = 28,572.91
  5. Step 5: Solve for x
    x = 28,572.91/138.36
  6. Step 6: Final answer
    x = 206.52

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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.