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Finding the Fourth Proportional to 203.86, 281.43 and 121

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Solution

The fourth proportional to 203.86, 281.43 and 121 is: 167.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.86 : 281.43 = 121 : x
  2. Step 2: Convert to fraction form
    203.86/281.43 = 121/x
  3. Step 3: Cross multiply
    203.86x = 281.43 × 121
  4. Step 4: Simplify right side
    203.86x = 34,053.03
  5. Step 5: Solve for x
    x = 34,053.03/203.86
  6. Step 6: Final answer
    x = 167.04

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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.