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Finding the Fourth Proportional to 843.79, 1,265.68 and 381.25

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Solution

The fourth proportional to 843.79, 1,265.68 and 381.25 is: 571.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.79 : 1,265.68 = 381.25 : x
  2. Step 2: Convert to fraction form
    843.79/1,265.68 = 381.25/x
  3. Step 3: Cross multiply
    843.79x = 1,265.68 × 381.25
  4. Step 4: Simplify right side
    843.79x = 482,537.21
  5. Step 5: Solve for x
    x = 482,537.21/843.79
  6. Step 6: Final answer
    x = 571.87

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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.