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Finding the Fourth Proportional to 467.20, 644.76 and 257.39

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Solution

The fourth proportional to 467.20, 644.76 and 257.39 is: 355.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    467.20 : 644.76 = 257.39 : x
  2. Step 2: Convert to fraction form
    467.20/644.76 = 257.39/x
  3. Step 3: Cross multiply
    467.20x = 644.76 × 257.39
  4. Step 4: Simplify right side
    467.20x = 165,957.60
  5. Step 5: Solve for x
    x = 165,957.60/467.20
  6. Step 6: Final answer
    x = 355.22

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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.