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Finding the Fourth Proportional to 994.38, 1,372.14 and 639.78

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Solution

The fourth proportional to 994.38, 1,372.14 and 639.78 is: 882.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.38 : 1,372.14 = 639.78 : x
  2. Step 2: Convert to fraction form
    994.38/1,372.14 = 639.78/x
  3. Step 3: Cross multiply
    994.38x = 1,372.14 × 639.78
  4. Step 4: Simplify right side
    994.38x = 877,867.73
  5. Step 5: Solve for x
    x = 877,867.73/994.38
  6. Step 6: Final answer
    x = 882.83

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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.