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Finding the Fourth Proportional to 136.81, 205.21 and 98.61

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Solution

The fourth proportional to 136.81, 205.21 and 98.61 is: 147.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.81 : 205.21 = 98.61 : x
  2. Step 2: Convert to fraction form
    136.81/205.21 = 98.61/x
  3. Step 3: Cross multiply
    136.81x = 205.21 × 98.61
  4. Step 4: Simplify right side
    136.81x = 20,235.76
  5. Step 5: Solve for x
    x = 20,235.76/136.81
  6. Step 6: Final answer
    x = 147.91

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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.