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Finding the Fourth Proportional to 280.81, 421.87 and 265.27

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Solution

The fourth proportional to 280.81, 421.87 and 265.27 is: 398.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.81 : 421.87 = 265.27 : x
  2. Step 2: Convert to fraction form
    280.81/421.87 = 265.27/x
  3. Step 3: Cross multiply
    280.81x = 421.87 × 265.27
  4. Step 4: Simplify right side
    280.81x = 111,908.73
  5. Step 5: Solve for x
    x = 111,908.73/280.81
  6. Step 6: Final answer
    x = 398.52

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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.