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Finding the Fourth Proportional to 281.81, 422.28 and 144.65

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Solution

The fourth proportional to 281.81, 422.28 and 144.65 is: 216.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.81 : 422.28 = 144.65 : x
  2. Step 2: Convert to fraction form
    281.81/422.28 = 144.65/x
  3. Step 3: Cross multiply
    281.81x = 422.28 × 144.65
  4. Step 4: Simplify right side
    281.81x = 61,083.86
  5. Step 5: Solve for x
    x = 61,083.86/281.81
  6. Step 6: Final answer
    x = 216.75

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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.