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Finding the Fourth Proportional to 843.89, 1,264.68 and 381.17

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Solution

The fourth proportional to 843.89, 1,264.68 and 381.17 is: 571.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.89 : 1,264.68 = 381.17 : x
  2. Step 2: Convert to fraction form
    843.89/1,264.68 = 381.17/x
  3. Step 3: Cross multiply
    843.89x = 1,264.68 × 381.17
  4. Step 4: Simplify right side
    843.89x = 482,061.24
  5. Step 5: Solve for x
    x = 482,061.24/843.89
  6. Step 6: Final answer
    x = 571.24

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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.