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Finding the Fourth Proportional to 203.88, 281.40 and 121

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Solution

The fourth proportional to 203.88, 281.40 and 121 is: 167.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.88 : 281.40 = 121 : x
  2. Step 2: Convert to fraction form
    203.88/281.40 = 121/x
  3. Step 3: Cross multiply
    203.88x = 281.40 × 121
  4. Step 4: Simplify right side
    203.88x = 34,049.40
  5. Step 5: Solve for x
    x = 34,049.40/203.88
  6. Step 6: Final answer
    x = 167.01

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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.