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Finding the Fourth Proportional to 203.66, 281.06 and 115.15

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Solution

The fourth proportional to 203.66, 281.06 and 115.15 is: 158.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.66 : 281.06 = 115.15 : x
  2. Step 2: Convert to fraction form
    203.66/281.06 = 115.15/x
  3. Step 3: Cross multiply
    203.66x = 281.06 × 115.15
  4. Step 4: Simplify right side
    203.66x = 32,363.21
  5. Step 5: Solve for x
    x = 32,363.21/203.66
  6. Step 6: Final answer
    x = 158.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.