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Finding the Fourth Proportional to 138.07, 207.13 and 41.87

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Solution

The fourth proportional to 138.07, 207.13 and 41.87 is: 62.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.07 : 207.13 = 41.87 : x
  2. Step 2: Convert to fraction form
    138.07/207.13 = 41.87/x
  3. Step 3: Cross multiply
    138.07x = 207.13 × 41.87
  4. Step 4: Simplify right side
    138.07x = 8,672.32
  5. Step 5: Solve for x
    x = 8,672.32/138.07
  6. Step 6: Final answer
    x = 62.81

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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.