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Finding the Fourth Proportional to 138, 207.08 and 69.56

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Solution

The fourth proportional to 138, 207.08 and 69.56 is: 104.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    138 : 207.08 = 69.56 : x
  2. Step 2: Convert to fraction form
    138/207.08 = 69.56/x
  3. Step 3: Cross multiply
    138x = 207.08 × 69.56
  4. Step 4: Simplify right side
    138x = 14,404.48
  5. Step 5: Solve for x
    x = 14,404.48/138
  6. Step 6: Final answer
    x = 104.38

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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.