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Finding the Fourth Proportional to 280.29, 421.25 and 136.11

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Solution

The fourth proportional to 280.29, 421.25 and 136.11 is: 204.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.29 : 421.25 = 136.11 : x
  2. Step 2: Convert to fraction form
    280.29/421.25 = 136.11/x
  3. Step 3: Cross multiply
    280.29x = 421.25 × 136.11
  4. Step 4: Simplify right side
    280.29x = 57,335.66
  5. Step 5: Solve for x
    x = 57,335.66/280.29
  6. Step 6: Final answer
    x = 204.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.