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Finding the Fourth Proportional to 203.76, 281.18 and 111.76

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Solution

The fourth proportional to 203.76, 281.18 and 111.76 is: 154.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.76 : 281.18 = 111.76 : x
  2. Step 2: Convert to fraction form
    203.76/281.18 = 111.76/x
  3. Step 3: Cross multiply
    203.76x = 281.18 × 111.76
  4. Step 4: Simplify right side
    203.76x = 31,424.68
  5. Step 5: Solve for x
    x = 31,424.68/203.76
  6. Step 6: Final answer
    x = 154.22

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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.