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Finding the Fourth Proportional to 743.47, 1,115.24 and 281.09

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Solution

The fourth proportional to 743.47, 1,115.24 and 281.09 is: 421.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.47 : 1,115.24 = 281.09 : x
  2. Step 2: Convert to fraction form
    743.47/1,115.24 = 281.09/x
  3. Step 3: Cross multiply
    743.47x = 1,115.24 × 281.09
  4. Step 4: Simplify right side
    743.47x = 313,484.19
  5. Step 5: Solve for x
    x = 313,484.19/743.47
  6. Step 6: Final answer
    x = 421.65

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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.