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Finding the Fourth Proportional to 639.97, 882.79 and 443.14

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Solution

The fourth proportional to 639.97, 882.79 and 443.14 is: 611.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.97 : 882.79 = 443.14 : x
  2. Step 2: Convert to fraction form
    639.97/882.79 = 443.14/x
  3. Step 3: Cross multiply
    639.97x = 882.79 × 443.14
  4. Step 4: Simplify right side
    639.97x = 391,199.56
  5. Step 5: Solve for x
    x = 391,199.56/639.97
  6. Step 6: Final answer
    x = 611.28

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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.