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Finding the Fourth Proportional to 639,858.47, 959,963.03 and 279,964.07

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Solution

The fourth proportional to 639,858.47, 959,963.03 and 279,964.07 is: 420,022.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,858.47 : 959,963.03 = 279,964.07 : x
  2. Step 2: Convert to fraction form
    639,858.47/959,963.03 = 279,964.07/x
  3. Step 3: Cross multiply
    639,858.47x = 959,963.03 × 279,964.07
  4. Step 4: Simplify right side
    639,858.47x = 268,755,160,028.15
  5. Step 5: Solve for x
    x = 268,755,160,028.15/639,858.47
  6. Step 6: Final answer
    x = 420,022.82

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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.