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Finding the Fourth Proportional to 743.45, 1,115.17 and 281.27

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Solution

The fourth proportional to 743.45, 1,115.17 and 281.27 is: 421.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.45 : 1,115.17 = 281.27 : x
  2. Step 2: Convert to fraction form
    743.45/1,115.17 = 281.27/x
  3. Step 3: Cross multiply
    743.45x = 1,115.17 × 281.27
  4. Step 4: Simplify right side
    743.45x = 313,665.95
  5. Step 5: Solve for x
    x = 313,665.95/743.45
  6. Step 6: Final answer
    x = 421.91

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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.