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Finding the Fourth Proportional to 408.78, 563.76 and 261.36

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Solution

The fourth proportional to 408.78, 563.76 and 261.36 is: 360.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.78 : 563.76 = 261.36 : x
  2. Step 2: Convert to fraction form
    408.78/563.76 = 261.36/x
  3. Step 3: Cross multiply
    408.78x = 563.76 × 261.36
  4. Step 4: Simplify right side
    408.78x = 147,344.31
  5. Step 5: Solve for x
    x = 147,344.31/408.78
  6. Step 6: Final answer
    x = 360.45

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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.