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Finding the Fourth Proportional to 639.20, 882.08 and 377.30

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Solution

The fourth proportional to 639.20, 882.08 and 377.30 is: 520.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.20 : 882.08 = 377.30 : x
  2. Step 2: Convert to fraction form
    639.20/882.08 = 377.30/x
  3. Step 3: Cross multiply
    639.20x = 882.08 × 377.30
  4. Step 4: Simplify right side
    639.20x = 332,808.78
  5. Step 5: Solve for x
    x = 332,808.78/639.20
  6. Step 6: Final answer
    x = 520.66

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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.