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Finding the Fourth Proportional to 639.53, 882.09 and 418.73

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Solution

The fourth proportional to 639.53, 882.09 and 418.73 is: 577.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.53 : 882.09 = 418.73 : x
  2. Step 2: Convert to fraction form
    639.53/882.09 = 418.73/x
  3. Step 3: Cross multiply
    639.53x = 882.09 × 418.73
  4. Step 4: Simplify right side
    639.53x = 369,353.14
  5. Step 5: Solve for x
    x = 369,353.14/639.53
  6. Step 6: Final answer
    x = 577.54

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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.