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Finding the Fourth Proportional to 644.73, 889.38 and 382.65

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Solution

The fourth proportional to 644.73, 889.38 and 382.65 is: 527.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.73 : 889.38 = 382.65 : x
  2. Step 2: Convert to fraction form
    644.73/889.38 = 382.65/x
  3. Step 3: Cross multiply
    644.73x = 889.38 × 382.65
  4. Step 4: Simplify right side
    644.73x = 340,321.26
  5. Step 5: Solve for x
    x = 340,321.26/644.73
  6. Step 6: Final answer
    x = 527.85

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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.