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Finding the Fourth Proportional to 639,451.15, 959,086 and 218,665.87

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Solution

The fourth proportional to 639,451.15, 959,086 and 218,665.87 is: 327,967.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,451.15 : 959,086 = 218,665.87 : x
  2. Step 2: Convert to fraction form
    639,451.15/959,086 = 218,665.87/x
  3. Step 3: Cross multiply
    639,451.15x = 959,086 × 218,665.87
  4. Step 4: Simplify right side
    639,451.15x = 209,719,374,594.82
  5. Step 5: Solve for x
    x = 209,719,374,594.82/639,451.15
  6. Step 6: Final answer
    x = 327,967.78

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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.