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Finding the Fourth Proportional to 468.48, 644.88 and 405.44

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Solution

The fourth proportional to 468.48, 644.88 and 405.44 is: 558.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    468.48 : 644.88 = 405.44 : x
  2. Step 2: Convert to fraction form
    468.48/644.88 = 405.44/x
  3. Step 3: Cross multiply
    468.48x = 644.88 × 405.44
  4. Step 4: Simplify right side
    468.48x = 261,456.92
  5. Step 5: Solve for x
    x = 261,456.92/468.48
  6. Step 6: Final answer
    x = 558.10

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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.