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Finding the Fourth Proportional to 136.15, 204.20 and 80.53

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Solution

The fourth proportional to 136.15, 204.20 and 80.53 is: 120.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.15 : 204.20 = 80.53 : x
  2. Step 2: Convert to fraction form
    136.15/204.20 = 80.53/x
  3. Step 3: Cross multiply
    136.15x = 204.20 × 80.53
  4. Step 4: Simplify right side
    136.15x = 16,444.23
  5. Step 5: Solve for x
    x = 16,444.23/136.15
  6. Step 6: Final answer
    x = 120.78

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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.