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Finding the Fourth Proportional to 644.50, 889.45 and 396.09

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Solution

The fourth proportional to 644.50, 889.45 and 396.09 is: 546.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.50 : 889.45 = 396.09 : x
  2. Step 2: Convert to fraction form
    644.50/889.45 = 396.09/x
  3. Step 3: Cross multiply
    644.50x = 889.45 × 396.09
  4. Step 4: Simplify right side
    644.50x = 352,295.82
  5. Step 5: Solve for x
    x = 352,295.82/644.50
  6. Step 6: Final answer
    x = 546.62

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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.