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Finding the Fourth Proportional to 644.37, 888.89 and 447.54

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Solution

The fourth proportional to 644.37, 888.89 and 447.54 is: 617.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.37 : 888.89 = 447.54 : x
  2. Step 2: Convert to fraction form
    644.37/888.89 = 447.54/x
  3. Step 3: Cross multiply
    644.37x = 888.89 × 447.54
  4. Step 4: Simplify right side
    644.37x = 397,811.59
  5. Step 5: Solve for x
    x = 397,811.59/644.37
  6. Step 6: Final answer
    x = 617.37

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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.