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Finding the Fourth Proportional to 403.86, 605.43 and 198.54

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Solution

The fourth proportional to 403.86, 605.43 and 198.54 is: 297.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.86 : 605.43 = 198.54 : x
  2. Step 2: Convert to fraction form
    403.86/605.43 = 198.54/x
  3. Step 3: Cross multiply
    403.86x = 605.43 × 198.54
  4. Step 4: Simplify right side
    403.86x = 120,202.07
  5. Step 5: Solve for x
    x = 120,202.07/403.86
  6. Step 6: Final answer
    x = 297.63

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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.