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Finding the Fourth Proportional to 438.85, 605.31 and 355.96

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Solution

The fourth proportional to 438.85, 605.31 and 355.96 is: 490.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.85 : 605.31 = 355.96 : x
  2. Step 2: Convert to fraction form
    438.85/605.31 = 355.96/x
  3. Step 3: Cross multiply
    438.85x = 605.31 × 355.96
  4. Step 4: Simplify right side
    438.85x = 215,466.15
  5. Step 5: Solve for x
    x = 215,466.15/438.85
  6. Step 6: Final answer
    x = 490.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.