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Finding the Fourth Proportional to 136.82, 204.86 and 90.61

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Solution

The fourth proportional to 136.82, 204.86 and 90.61 is: 135.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.82 : 204.86 = 90.61 : x
  2. Step 2: Convert to fraction form
    136.82/204.86 = 90.61/x
  3. Step 3: Cross multiply
    136.82x = 204.86 × 90.61
  4. Step 4: Simplify right side
    136.82x = 18,562.08
  5. Step 5: Solve for x
    x = 18,562.08/136.82
  6. Step 6: Final answer
    x = 135.67

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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.