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Finding the Fourth Proportional to 136.04, 203.68 and 81.92

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Solution

The fourth proportional to 136.04, 203.68 and 81.92 is: 122.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.04 : 203.68 = 81.92 : x
  2. Step 2: Convert to fraction form
    136.04/203.68 = 81.92/x
  3. Step 3: Cross multiply
    136.04x = 203.68 × 81.92
  4. Step 4: Simplify right side
    136.04x = 16,685.47
  5. Step 5: Solve for x
    x = 16,685.47/136.04
  6. Step 6: Final answer
    x = 122.65

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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.