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Finding the Fourth Proportional to 467.31, 644.90 and 257.48

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Solution

The fourth proportional to 467.31, 644.90 and 257.48 is: 355.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    467.31 : 644.90 = 257.48 : x
  2. Step 2: Convert to fraction form
    467.31/644.90 = 257.48/x
  3. Step 3: Cross multiply
    467.31x = 644.90 × 257.48
  4. Step 4: Simplify right side
    467.31x = 166,048.85
  5. Step 5: Solve for x
    x = 166,048.85/467.31
  6. Step 6: Final answer
    x = 355.33

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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.