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Finding the Fourth Proportional to 203.15, 280.26 and 115.77

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Solution

The fourth proportional to 203.15, 280.26 and 115.77 is: 159.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.15 : 280.26 = 115.77 : x
  2. Step 2: Convert to fraction form
    203.15/280.26 = 115.77/x
  3. Step 3: Cross multiply
    203.15x = 280.26 × 115.77
  4. Step 4: Simplify right side
    203.15x = 32,445.70
  5. Step 5: Solve for x
    x = 32,445.70/203.15
  6. Step 6: Final answer
    x = 159.72

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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.