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Finding the Fourth Proportional to 281.87, 422.56 and 221.26

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Solution

The fourth proportional to 281.87, 422.56 and 221.26 is: 331.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.87 : 422.56 = 221.26 : x
  2. Step 2: Convert to fraction form
    281.87/422.56 = 221.26/x
  3. Step 3: Cross multiply
    281.87x = 422.56 × 221.26
  4. Step 4: Simplify right side
    281.87x = 93,495.63
  5. Step 5: Solve for x
    x = 93,495.63/281.87
  6. Step 6: Final answer
    x = 331.70

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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.