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Finding the Fourth Proportional to 403.98, 605.61 and 391.74

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Solution

The fourth proportional to 403.98, 605.61 and 391.74 is: 587.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.98 : 605.61 = 391.74 : x
  2. Step 2: Convert to fraction form
    403.98/605.61 = 391.74/x
  3. Step 3: Cross multiply
    403.98x = 605.61 × 391.74
  4. Step 4: Simplify right side
    403.98x = 237,241.66
  5. Step 5: Solve for x
    x = 237,241.66/403.98
  6. Step 6: Final answer
    x = 587.26

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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.