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Finding the Fourth Proportional to 993.38, 1,371.33 and 639.50

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Solution

The fourth proportional to 993.38, 1,371.33 and 639.50 is: 882.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.38 : 1,371.33 = 639.50 : x
  2. Step 2: Convert to fraction form
    993.38/1,371.33 = 639.50/x
  3. Step 3: Cross multiply
    993.38x = 1,371.33 × 639.50
  4. Step 4: Simplify right side
    993.38x = 876,958.68
  5. Step 5: Solve for x
    x = 876,958.68/993.38
  6. Step 6: Final answer
    x = 882.81

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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.