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Finding the Fourth Proportional to 203.07, 280.21 and 115.72

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Solution

The fourth proportional to 203.07, 280.21 and 115.72 is: 159.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.07 : 280.21 = 115.72 : x
  2. Step 2: Convert to fraction form
    203.07/280.21 = 115.72/x
  3. Step 3: Cross multiply
    203.07x = 280.21 × 115.72
  4. Step 4: Simplify right side
    203.07x = 32,425.90
  5. Step 5: Solve for x
    x = 32,425.90/203.07
  6. Step 6: Final answer
    x = 159.68

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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.