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Finding the Fourth Proportional to 644.14, 882.11 and 640.36

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Solution

The fourth proportional to 644.14, 882.11 and 640.36 is: 876.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.14 : 882.11 = 640.36 : x
  2. Step 2: Convert to fraction form
    644.14/882.11 = 640.36/x
  3. Step 3: Cross multiply
    644.14x = 882.11 × 640.36
  4. Step 4: Simplify right side
    644.14x = 564,867.96
  5. Step 5: Solve for x
    x = 564,867.96/644.14
  6. Step 6: Final answer
    x = 876.93

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.