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Finding the Fourth Proportional to 664.08, 994.20 and 639.12

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Solution

The fourth proportional to 664.08, 994.20 and 639.12 is: 956.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.08 : 994.20 = 639.12 : x
  2. Step 2: Convert to fraction form
    664.08/994.20 = 639.12/x
  3. Step 3: Cross multiply
    664.08x = 994.20 × 639.12
  4. Step 4: Simplify right side
    664.08x = 635,413.10
  5. Step 5: Solve for x
    x = 635,413.10/664.08
  6. Step 6: Final answer
    x = 956.83

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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.