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Finding the Fourth Proportional to 203.43, 280.78 and 120.59

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Solution

The fourth proportional to 203.43, 280.78 and 120.59 is: 166.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.43 : 280.78 = 120.59 : x
  2. Step 2: Convert to fraction form
    203.43/280.78 = 120.59/x
  3. Step 3: Cross multiply
    203.43x = 280.78 × 120.59
  4. Step 4: Simplify right side
    203.43x = 33,858.61
  5. Step 5: Solve for x
    x = 33,858.61/203.43
  6. Step 6: Final answer
    x = 166.44

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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.