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Finding the Fourth Proportional to 639.28, 882.30 and 377.29

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Solution

The fourth proportional to 639.28, 882.30 and 377.29 is: 520.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.28 : 882.30 = 377.29 : x
  2. Step 2: Convert to fraction form
    639.28/882.30 = 377.29/x
  3. Step 3: Cross multiply
    639.28x = 882.30 × 377.29
  4. Step 4: Simplify right side
    639.28x = 332,882.97
  5. Step 5: Solve for x
    x = 332,882.97/639.28
  6. Step 6: Final answer
    x = 520.72

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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.