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Finding the Fourth Proportional to 408.28, 563.98 and 283.72

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Solution

The fourth proportional to 408.28, 563.98 and 283.72 is: 391.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.28 : 563.98 = 283.72 : x
  2. Step 2: Convert to fraction form
    408.28/563.98 = 283.72/x
  3. Step 3: Cross multiply
    408.28x = 563.98 × 283.72
  4. Step 4: Simplify right side
    408.28x = 160,012.41
  5. Step 5: Solve for x
    x = 160,012.41/408.28
  6. Step 6: Final answer
    x = 391.92

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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.