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Finding the Fourth Proportional to 408.87, 564.49 and 315.44

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Solution

The fourth proportional to 408.87, 564.49 and 315.44 is: 435.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.87 : 564.49 = 315.44 : x
  2. Step 2: Convert to fraction form
    408.87/564.49 = 315.44/x
  3. Step 3: Cross multiply
    408.87x = 564.49 × 315.44
  4. Step 4: Simplify right side
    408.87x = 178,063.30
  5. Step 5: Solve for x
    x = 178,063.30/408.87
  6. Step 6: Final answer
    x = 435.50

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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.