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Finding the Fourth Proportional to 639,889.92, 959,951.52 and 320,208.96

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Solution

The fourth proportional to 639,889.92, 959,951.52 and 320,208.96 is: 480,371.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,889.92 : 959,951.52 = 320,208.96 : x
  2. Step 2: Convert to fraction form
    639,889.92/959,951.52 = 320,208.96/x
  3. Step 3: Cross multiply
    639,889.92x = 959,951.52 × 320,208.96
  4. Step 4: Simplify right side
    639,889.92x = 307,385,077,869.62
  5. Step 5: Solve for x
    x = 307,385,077,869.62/639,889.92
  6. Step 6: Final answer
    x = 480,371.81

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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.