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Finding the Fourth Proportional to 644,529.40, 965,627.70 and 394,919.80

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Solution

The fourth proportional to 644,529.40, 965,627.70 and 394,919.80 is: 591,665.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,529.40 : 965,627.70 = 394,919.80 : x
  2. Step 2: Convert to fraction form
    644,529.40/965,627.70 = 394,919.80/x
  3. Step 3: Cross multiply
    644,529.40x = 965,627.70 × 394,919.80
  4. Step 4: Simplify right side
    644,529.40x = 381,345,498,158.46
  5. Step 5: Solve for x
    x = 381,345,498,158.46/644,529.40
  6. Step 6: Final answer
    x = 591,665.02

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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.