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Finding the Fourth Proportional to 138.92, 207.52 and 136.22

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Solution

The fourth proportional to 138.92, 207.52 and 136.22 is: 203.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.92 : 207.52 = 136.22 : x
  2. Step 2: Convert to fraction form
    138.92/207.52 = 136.22/x
  3. Step 3: Cross multiply
    138.92x = 207.52 × 136.22
  4. Step 4: Simplify right side
    138.92x = 28,268.37
  5. Step 5: Solve for x
    x = 28,268.37/138.92
  6. Step 6: Final answer
    x = 203.49

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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.