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Finding the Fourth Proportional to 662.43, 993.77 and 388.56

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Solution

The fourth proportional to 662.43, 993.77 and 388.56 is: 582.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.43 : 993.77 = 388.56 : x
  2. Step 2: Convert to fraction form
    662.43/993.77 = 388.56/x
  3. Step 3: Cross multiply
    662.43x = 993.77 × 388.56
  4. Step 4: Simplify right side
    662.43x = 386,135.27
  5. Step 5: Solve for x
    x = 386,135.27/662.43
  6. Step 6: Final answer
    x = 582.91

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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.