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Finding the Fourth Proportional to 136.19, 204.14 and 72.11

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Solution

The fourth proportional to 136.19, 204.14 and 72.11 is: 108.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.19 : 204.14 = 72.11 : x
  2. Step 2: Convert to fraction form
    136.19/204.14 = 72.11/x
  3. Step 3: Cross multiply
    136.19x = 204.14 × 72.11
  4. Step 4: Simplify right side
    136.19x = 14,720.54
  5. Step 5: Solve for x
    x = 14,720.54/136.19
  6. Step 6: Final answer
    x = 108.09

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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.