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Finding the Fourth Proportional to 639,704.70, 959,686.65 and 219,023.10

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Solution

The fourth proportional to 639,704.70, 959,686.65 and 219,023.10 is: 328,579.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,704.70 : 959,686.65 = 219,023.10 : x
  2. Step 2: Convert to fraction form
    639,704.70/959,686.65 = 219,023.10/x
  3. Step 3: Cross multiply
    639,704.70x = 959,686.65 × 219,023.10
  4. Step 4: Simplify right side
    639,704.70x = 210,193,545,111.62
  5. Step 5: Solve for x
    x = 210,193,545,111.62/639,704.70
  6. Step 6: Final answer
    x = 328,579.02

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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.