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Finding the Fourth Proportional to 138.92, 207.36 and 120.69

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Solution

The fourth proportional to 138.92, 207.36 and 120.69 is: 180.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.92 : 207.36 = 120.69 : x
  2. Step 2: Convert to fraction form
    138.92/207.36 = 120.69/x
  3. Step 3: Cross multiply
    138.92x = 207.36 × 120.69
  4. Step 4: Simplify right side
    138.92x = 25,026.28
  5. Step 5: Solve for x
    x = 25,026.28/138.92
  6. Step 6: Final answer
    x = 180.16

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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.