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Finding the Fourth Proportional to 281.56, 422.16 and 137.20

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Solution

The fourth proportional to 281.56, 422.16 and 137.20 is: 205.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.56 : 422.16 = 137.20 : x
  2. Step 2: Convert to fraction form
    281.56/422.16 = 137.20/x
  3. Step 3: Cross multiply
    281.56x = 422.16 × 137.20
  4. Step 4: Simplify right side
    281.56x = 57,920.35
  5. Step 5: Solve for x
    x = 57,920.35/281.56
  6. Step 6: Final answer
    x = 205.71

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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.