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Finding the Fourth Proportional to 644.34, 889.44 and 408.62

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Solution

The fourth proportional to 644.34, 889.44 and 408.62 is: 564.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.34 : 889.44 = 408.62 : x
  2. Step 2: Convert to fraction form
    644.34/889.44 = 408.62/x
  3. Step 3: Cross multiply
    644.34x = 889.44 × 408.62
  4. Step 4: Simplify right side
    644.34x = 363,442.97
  5. Step 5: Solve for x
    x = 363,442.97/644.34
  6. Step 6: Final answer
    x = 564.05

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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.