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Finding the Fourth Proportional to 439.34, 605.21 and 340.92

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Solution

The fourth proportional to 439.34, 605.21 and 340.92 is: 469.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.34 : 605.21 = 340.92 : x
  2. Step 2: Convert to fraction form
    439.34/605.21 = 340.92/x
  3. Step 3: Cross multiply
    439.34x = 605.21 × 340.92
  4. Step 4: Simplify right side
    439.34x = 206,326.49
  5. Step 5: Solve for x
    x = 206,326.49/439.34
  6. Step 6: Final answer
    x = 469.63

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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.