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Finding the Fourth Proportional to 136.42, 189.11 and 129.38

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Solution

The fourth proportional to 136.42, 189.11 and 129.38 is: 179.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.42 : 189.11 = 129.38 : x
  2. Step 2: Convert to fraction form
    136.42/189.11 = 129.38/x
  3. Step 3: Cross multiply
    136.42x = 189.11 × 129.38
  4. Step 4: Simplify right side
    136.42x = 24,466.43
  5. Step 5: Solve for x
    x = 24,466.43/136.42
  6. Step 6: Final answer
    x = 179.35

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.