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Finding the Fourth Proportional to 621.53, 858.12 and 385.73

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Solution

The fourth proportional to 621.53, 858.12 and 385.73 is: 532.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.53 : 858.12 = 385.73 : x
  2. Step 2: Convert to fraction form
    621.53/858.12 = 385.73/x
  3. Step 3: Cross multiply
    621.53x = 858.12 × 385.73
  4. Step 4: Simplify right side
    621.53x = 331,000.70
  5. Step 5: Solve for x
    x = 331,000.70/621.53
  6. Step 6: Final answer
    x = 532.56

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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.