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Finding the Fourth Proportional to 403.90, 605.86 and 198.56

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Solution

The fourth proportional to 403.90, 605.86 and 198.56 is: 297.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.90 : 605.86 = 198.56 : x
  2. Step 2: Convert to fraction form
    403.90/605.86 = 198.56/x
  3. Step 3: Cross multiply
    403.90x = 605.86 × 198.56
  4. Step 4: Simplify right side
    403.90x = 120,299.56
  5. Step 5: Solve for x
    x = 120,299.56/403.90
  6. Step 6: Final answer
    x = 297.84

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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.