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Finding the Fourth Proportional to 408.20, 563.27 and 258.75

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Solution

The fourth proportional to 408.20, 563.27 and 258.75 is: 357.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.20 : 563.27 = 258.75 : x
  2. Step 2: Convert to fraction form
    408.20/563.27 = 258.75/x
  3. Step 3: Cross multiply
    408.20x = 563.27 × 258.75
  4. Step 4: Simplify right side
    408.20x = 145,744.82
  5. Step 5: Solve for x
    x = 145,744.82/408.20
  6. Step 6: Final answer
    x = 357.05

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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.