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Finding the Fourth Proportional to 136.28, 204.36 and 72.14

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Solution

The fourth proportional to 136.28, 204.36 and 72.14 is: 108.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.28 : 204.36 = 72.14 : x
  2. Step 2: Convert to fraction form
    136.28/204.36 = 72.14/x
  3. Step 3: Cross multiply
    136.28x = 204.36 × 72.14
  4. Step 4: Simplify right side
    136.28x = 14,742.53
  5. Step 5: Solve for x
    x = 14,742.53/136.28
  6. Step 6: Final answer
    x = 108.18

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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.