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Finding the Fourth Proportional to 662.48, 993.85 and 385.43

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Solution

The fourth proportional to 662.48, 993.85 and 385.43 is: 578.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.48 : 993.85 = 385.43 : x
  2. Step 2: Convert to fraction form
    662.48/993.85 = 385.43/x
  3. Step 3: Cross multiply
    662.48x = 993.85 × 385.43
  4. Step 4: Simplify right side
    662.48x = 383,059.61
  5. Step 5: Solve for x
    x = 383,059.61/662.48
  6. Step 6: Final answer
    x = 578.22

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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.