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Finding the Fourth Proportional to 621.88, 858.09 and 385.86

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Solution

The fourth proportional to 621.88, 858.09 and 385.86 is: 532.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.88 : 858.09 = 385.86 : x
  2. Step 2: Convert to fraction form
    621.88/858.09 = 385.86/x
  3. Step 3: Cross multiply
    621.88x = 858.09 × 385.86
  4. Step 4: Simplify right side
    621.88x = 331,107.27
  5. Step 5: Solve for x
    x = 331,107.27/621.88
  6. Step 6: Final answer
    x = 532.43

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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.