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Finding the Fourth Proportional to 136.21, 203.86 and 84.68

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Solution

The fourth proportional to 136.21, 203.86 and 84.68 is: 126.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.21 : 203.86 = 84.68 : x
  2. Step 2: Convert to fraction form
    136.21/203.86 = 84.68/x
  3. Step 3: Cross multiply
    136.21x = 203.86 × 84.68
  4. Step 4: Simplify right side
    136.21x = 17,262.86
  5. Step 5: Solve for x
    x = 17,262.86/136.21
  6. Step 6: Final answer
    x = 126.74

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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.