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Finding the Fourth Proportional to 136.18, 203.92 and 90.39

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Solution

The fourth proportional to 136.18, 203.92 and 90.39 is: 135.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.18 : 203.92 = 90.39 : x
  2. Step 2: Convert to fraction form
    136.18/203.92 = 90.39/x
  3. Step 3: Cross multiply
    136.18x = 203.92 × 90.39
  4. Step 4: Simplify right side
    136.18x = 18,431.88
  5. Step 5: Solve for x
    x = 18,431.88/136.18
  6. Step 6: Final answer
    x = 135.35

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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.