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Finding the Fourth Proportional to 639,857.71, 959,961.91 and 279,963.32

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Solution

The fourth proportional to 639,857.71, 959,961.91 and 279,963.32 is: 420,021.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,857.71 : 959,961.91 = 279,963.32 : x
  2. Step 2: Convert to fraction form
    639,857.71/959,961.91 = 279,963.32/x
  3. Step 3: Cross multiply
    639,857.71x = 959,961.91 × 279,963.32
  4. Step 4: Simplify right side
    639,857.71x = 268,754,123,822.14
  5. Step 5: Solve for x
    x = 268,754,123,822.14/639,857.71
  6. Step 6: Final answer
    x = 420,021.70

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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.