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Finding the Fourth Proportional to 281.52, 421.70 and 229.91

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Solution

The fourth proportional to 281.52, 421.70 and 229.91 is: 344.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.52 : 421.70 = 229.91 : x
  2. Step 2: Convert to fraction form
    281.52/421.70 = 229.91/x
  3. Step 3: Cross multiply
    281.52x = 421.70 × 229.91
  4. Step 4: Simplify right side
    281.52x = 96,949.79
  5. Step 5: Solve for x
    x = 96,949.79/281.52
  6. Step 6: Final answer
    x = 344.38

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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.