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Finding the Fourth Proportional to 281.58, 422.55 and 144.78

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Solution

The fourth proportional to 281.58, 422.55 and 144.78 is: 217.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.58 : 422.55 = 144.78 : x
  2. Step 2: Convert to fraction form
    281.58/422.55 = 144.78/x
  3. Step 3: Cross multiply
    281.58x = 422.55 × 144.78
  4. Step 4: Simplify right side
    281.58x = 61,176.79
  5. Step 5: Solve for x
    x = 61,176.79/281.58
  6. Step 6: Final answer
    x = 217.26

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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.