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Finding the Fourth Proportional to 281.72, 421.82 and 159.36

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Solution

The fourth proportional to 281.72, 421.82 and 159.36 is: 238.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.72 : 421.82 = 159.36 : x
  2. Step 2: Convert to fraction form
    281.72/421.82 = 159.36/x
  3. Step 3: Cross multiply
    281.72x = 421.82 × 159.36
  4. Step 4: Simplify right side
    281.72x = 67,221.24
  5. Step 5: Solve for x
    x = 67,221.24/281.72
  6. Step 6: Final answer
    x = 238.61

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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.