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Finding the Fourth Proportional to 408.72, 563.61 and 315.48

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Solution

The fourth proportional to 408.72, 563.61 and 315.48 is: 435.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.72 : 563.61 = 315.48 : x
  2. Step 2: Convert to fraction form
    408.72/563.61 = 315.48/x
  3. Step 3: Cross multiply
    408.72x = 563.61 × 315.48
  4. Step 4: Simplify right side
    408.72x = 177,807.68
  5. Step 5: Solve for x
    x = 177,807.68/408.72
  6. Step 6: Final answer
    x = 435.04

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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.