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Finding the Fourth Proportional to 408.37, 563.40 and 231.31

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Solution

The fourth proportional to 408.37, 563.40 and 231.31 is: 319.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.37 : 563.40 = 231.31 : x
  2. Step 2: Convert to fraction form
    408.37/563.40 = 231.31/x
  3. Step 3: Cross multiply
    408.37x = 563.40 × 231.31
  4. Step 4: Simplify right side
    408.37x = 130,317.82
  5. Step 5: Solve for x
    x = 130,317.82/408.37
  6. Step 6: Final answer
    x = 319.12

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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.