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Finding the Fourth Proportional to 644.41, 889.21 and 382.38

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Solution

The fourth proportional to 644.41, 889.21 and 382.38 is: 527.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.41 : 889.21 = 382.38 : x
  2. Step 2: Convert to fraction form
    644.41/889.21 = 382.38/x
  3. Step 3: Cross multiply
    644.41x = 889.21 × 382.38
  4. Step 4: Simplify right side
    644.41x = 340,016.12
  5. Step 5: Solve for x
    x = 340,016.12/644.41
  6. Step 6: Final answer
    x = 527.64

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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.