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Finding the Fourth Proportional to 138.94, 207.18 and 135.29

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Solution

The fourth proportional to 138.94, 207.18 and 135.29 is: 201.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.94 : 207.18 = 135.29 : x
  2. Step 2: Convert to fraction form
    138.94/207.18 = 135.29/x
  3. Step 3: Cross multiply
    138.94x = 207.18 × 135.29
  4. Step 4: Simplify right side
    138.94x = 28,029.90
  5. Step 5: Solve for x
    x = 28,029.90/138.94
  6. Step 6: Final answer
    x = 201.74

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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.