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Finding the Fourth Proportional to 281.82, 422.69 and 99.17

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Solution

The fourth proportional to 281.82, 422.69 and 99.17 is: 148.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.82 : 422.69 = 99.17 : x
  2. Step 2: Convert to fraction form
    281.82/422.69 = 99.17/x
  3. Step 3: Cross multiply
    281.82x = 422.69 × 99.17
  4. Step 4: Simplify right side
    281.82x = 41,915.56
  5. Step 5: Solve for x
    x = 41,915.56/281.82
  6. Step 6: Final answer
    x = 148.73

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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.