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Finding the Fourth Proportional to 281.85, 422.79 and 76.41

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Solution

The fourth proportional to 281.85, 422.79 and 76.41 is: 114.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.85 : 422.79 = 76.41 : x
  2. Step 2: Convert to fraction form
    281.85/422.79 = 76.41/x
  3. Step 3: Cross multiply
    281.85x = 422.79 × 76.41
  4. Step 4: Simplify right side
    281.85x = 32,305.38
  5. Step 5: Solve for x
    x = 32,305.38/281.85
  6. Step 6: Final answer
    x = 114.62

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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.