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Finding the Fourth Proportional to 467.18, 644.68 and 257.34

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Solution

The fourth proportional to 467.18, 644.68 and 257.34 is: 355.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    467.18 : 644.68 = 257.34 : x
  2. Step 2: Convert to fraction form
    467.18/644.68 = 257.34/x
  3. Step 3: Cross multiply
    467.18x = 644.68 × 257.34
  4. Step 4: Simplify right side
    467.18x = 165,901.95
  5. Step 5: Solve for x
    x = 165,901.95/467.18
  6. Step 6: Final answer
    x = 355.11

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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.