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Finding the Fourth Proportional to 139.35, 207.75 and 132.87

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Solution

The fourth proportional to 139.35, 207.75 and 132.87 is: 198.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.35 : 207.75 = 132.87 : x
  2. Step 2: Convert to fraction form
    139.35/207.75 = 132.87/x
  3. Step 3: Cross multiply
    139.35x = 207.75 × 132.87
  4. Step 4: Simplify right side
    139.35x = 27,603.74
  5. Step 5: Solve for x
    x = 27,603.74/139.35
  6. Step 6: Final answer
    x = 198.09

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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.