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Finding the Fourth Proportional to 639.38, 882.45 and 377.54

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Solution

The fourth proportional to 639.38, 882.45 and 377.54 is: 521.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.38 : 882.45 = 377.54 : x
  2. Step 2: Convert to fraction form
    639.38/882.45 = 377.54/x
  3. Step 3: Cross multiply
    639.38x = 882.45 × 377.54
  4. Step 4: Simplify right side
    639.38x = 333,160.17
  5. Step 5: Solve for x
    x = 333,160.17/639.38
  6. Step 6: Final answer
    x = 521.07

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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.