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Finding the Fourth Proportional to 281.73, 422.75 and 280.88

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Solution

The fourth proportional to 281.73, 422.75 and 280.88 is: 421.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.73 : 422.75 = 280.88 : x
  2. Step 2: Convert to fraction form
    281.73/422.75 = 280.88/x
  3. Step 3: Cross multiply
    281.73x = 422.75 × 280.88
  4. Step 4: Simplify right side
    281.73x = 118,740.61
  5. Step 5: Solve for x
    x = 118,740.61/281.73
  6. Step 6: Final answer
    x = 421.46

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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.