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Finding the Fourth Proportional to 1,331.90, 1,997.94 and 638.87

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Solution

The fourth proportional to 1,331.90, 1,997.94 and 638.87 is: 958.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.90 : 1,997.94 = 638.87 : x
  2. Step 2: Convert to fraction form
    1,331.90/1,997.94 = 638.87/x
  3. Step 3: Cross multiply
    1,331.90x = 1,997.94 × 638.87
  4. Step 4: Simplify right side
    1,331.90x = 1,276,413.94
  5. Step 5: Solve for x
    x = 1,276,413.94/1,331.90
  6. Step 6: Final answer
    x = 958.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.