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Finding the Fourth Proportional to 439.40, 605.60 and 418.88

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Solution

The fourth proportional to 439.40, 605.60 and 418.88 is: 577.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.40 : 605.60 = 418.88 : x
  2. Step 2: Convert to fraction form
    439.40/605.60 = 418.88/x
  3. Step 3: Cross multiply
    439.40x = 605.60 × 418.88
  4. Step 4: Simplify right side
    439.40x = 253,673.73
  5. Step 5: Solve for x
    x = 253,673.73/439.40
  6. Step 6: Final answer
    x = 577.32

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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.