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Finding the Fourth Proportional to 408.72, 563.60 and 253.20

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Solution

The fourth proportional to 408.72, 563.60 and 253.20 is: 349.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.72 : 563.60 = 253.20 : x
  2. Step 2: Convert to fraction form
    408.72/563.60 = 253.20/x
  3. Step 3: Cross multiply
    408.72x = 563.60 × 253.20
  4. Step 4: Simplify right side
    408.72x = 142,703.52
  5. Step 5: Solve for x
    x = 142,703.52/408.72
  6. Step 6: Final answer
    x = 349.15

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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.