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Finding the Fourth Proportional to 743.61, 1,115.25 and 281.38

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Solution

The fourth proportional to 743.61, 1,115.25 and 281.38 is: 422.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.61 : 1,115.25 = 281.38 : x
  2. Step 2: Convert to fraction form
    743.61/1,115.25 = 281.38/x
  3. Step 3: Cross multiply
    743.61x = 1,115.25 × 281.38
  4. Step 4: Simplify right side
    743.61x = 313,809.05
  5. Step 5: Solve for x
    x = 313,809.05/743.61
  6. Step 6: Final answer
    x = 422.01

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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.