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Finding the Fourth Proportional to 136.39, 204.55 and 71.42

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Solution

The fourth proportional to 136.39, 204.55 and 71.42 is: 107.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.39 : 204.55 = 71.42 : x
  2. Step 2: Convert to fraction form
    136.39/204.55 = 71.42/x
  3. Step 3: Cross multiply
    136.39x = 204.55 × 71.42
  4. Step 4: Simplify right side
    136.39x = 14,608.96
  5. Step 5: Solve for x
    x = 14,608.96/136.39
  6. Step 6: Final answer
    x = 107.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.