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Finding the Fourth Proportional to 439.22, 605.54 and 339.80

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Solution

The fourth proportional to 439.22, 605.54 and 339.80 is: 468.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.22 : 605.54 = 339.80 : x
  2. Step 2: Convert to fraction form
    439.22/605.54 = 339.80/x
  3. Step 3: Cross multiply
    439.22x = 605.54 × 339.80
  4. Step 4: Simplify right side
    439.22x = 205,760.31
  5. Step 5: Solve for x
    x = 205,760.31/439.22
  6. Step 6: Final answer
    x = 468.46

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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.