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Finding the Fourth Proportional to 743.71, 1,115.90 and 281.72

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Solution

The fourth proportional to 743.71, 1,115.90 and 281.72 is: 422.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.71 : 1,115.90 = 281.72 : x
  2. Step 2: Convert to fraction form
    743.71/1,115.90 = 281.72/x
  3. Step 3: Cross multiply
    743.71x = 1,115.90 × 281.72
  4. Step 4: Simplify right side
    743.71x = 314,371.35
  5. Step 5: Solve for x
    x = 314,371.35/743.71
  6. Step 6: Final answer
    x = 422.71

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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.