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Finding the Fourth Proportional to 1,289,905.92, 1,934,863.44 and 391,355.28

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Solution

The fourth proportional to 1,289,905.92, 1,934,863.44 and 391,355.28 is: 587,034.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289,905.92 : 1,934,863.44 = 391,355.28 : x
  2. Step 2: Convert to fraction form
    1,289,905.92/1,934,863.44 = 391,355.28/x
  3. Step 3: Cross multiply
    1,289,905.92x = 1,934,863.44 × 391,355.28
  4. Step 4: Simplify right side
    1,289,905.92x = 757,219,023,322.96
  5. Step 5: Solve for x
    x = 757,219,023,322.96/1,289,905.92
  6. Step 6: Final answer
    x = 587,034.30

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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.