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Finding the Fourth Proportional to 138.56, 207.84 and 51.92

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Solution

The fourth proportional to 138.56, 207.84 and 51.92 is: 77.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.56 : 207.84 = 51.92 : x
  2. Step 2: Convert to fraction form
    138.56/207.84 = 51.92/x
  3. Step 3: Cross multiply
    138.56x = 207.84 × 51.92
  4. Step 4: Simplify right side
    138.56x = 10,790.01
  5. Step 5: Solve for x
    x = 10,790.01/138.56
  6. Step 6: Final answer
    x = 77.87

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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.