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Finding the Fourth Proportional to 639,861.48, 959,843.25 and 219,141

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Solution

The fourth proportional to 639,861.48, 959,843.25 and 219,141 is: 328,728.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,861.48 : 959,843.25 = 219,141 : x
  2. Step 2: Convert to fraction form
    639,861.48/959,843.25 = 219,141/x
  3. Step 3: Cross multiply
    639,861.48x = 959,843.25 × 219,141
  4. Step 4: Simplify right side
    639,861.48x = 210,341,009,648.25
  5. Step 5: Solve for x
    x = 210,341,009,648.25/639,861.48
  6. Step 6: Final answer
    x = 328,728.98

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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.