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Finding the Fourth Proportional to 639,708.20, 959,691.90 and 219,026.60

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Solution

The fourth proportional to 639,708.20, 959,691.90 and 219,026.60 is: 328,584.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,708.20 : 959,691.90 = 219,026.60 : x
  2. Step 2: Convert to fraction form
    639,708.20/959,691.90 = 219,026.60/x
  3. Step 3: Cross multiply
    639,708.20x = 959,691.90 × 219,026.60
  4. Step 4: Simplify right side
    639,708.20x = 210,198,053,904.54
  5. Step 5: Solve for x
    x = 210,198,053,904.54/639,708.20
  6. Step 6: Final answer
    x = 328,584.27

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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.