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Finding the Fourth Proportional to 135.28, 203.90 and 122.64

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Solution

The fourth proportional to 135.28, 203.90 and 122.64 is: 184.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.28 : 203.90 = 122.64 : x
  2. Step 2: Convert to fraction form
    135.28/203.90 = 122.64/x
  3. Step 3: Cross multiply
    135.28x = 203.90 × 122.64
  4. Step 4: Simplify right side
    135.28x = 25,006.30
  5. Step 5: Solve for x
    x = 25,006.30/135.28
  6. Step 6: Final answer
    x = 184.85

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.