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Finding the Fourth Proportional to 843.88, 1,266.78 and 411.88

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Solution

The fourth proportional to 843.88, 1,266.78 and 411.88 is: 618.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.88 : 1,266.78 = 411.88 : x
  2. Step 2: Convert to fraction form
    843.88/1,266.78 = 411.88/x
  3. Step 3: Cross multiply
    843.88x = 1,266.78 × 411.88
  4. Step 4: Simplify right side
    843.88x = 521,761.35
  5. Step 5: Solve for x
    x = 521,761.35/843.88
  6. Step 6: Final answer
    x = 618.29

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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.