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Finding the Fourth Proportional to 686.11, 946.68 and 406.43

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Solution

The fourth proportional to 686.11, 946.68 and 406.43 is: 560.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.11 : 946.68 = 406.43 : x
  2. Step 2: Convert to fraction form
    686.11/946.68 = 406.43/x
  3. Step 3: Cross multiply
    686.11x = 946.68 × 406.43
  4. Step 4: Simplify right side
    686.11x = 384,757.97
  5. Step 5: Solve for x
    x = 384,757.97/686.11
  6. Step 6: Final answer
    x = 560.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.