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Finding the Fourth Proportional to 1,393,416.09, 1,922,936.63 and 781,704.90

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Solution

The fourth proportional to 1,393,416.09, 1,922,936.63 and 781,704.90 is: 1,078,765.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393,416.09 : 1,922,936.63 = 781,704.90 : x
  2. Step 2: Convert to fraction form
    1,393,416.09/1,922,936.63 = 781,704.90/x
  3. Step 3: Cross multiply
    1,393,416.09x = 1,922,936.63 × 781,704.90
  4. Step 4: Simplify right side
    1,393,416.09x = 1,503,168,982,151.96
  5. Step 5: Solve for x
    x = 1,503,168,982,151.96/1,393,416.09
  6. Step 6: Final answer
    x = 1,078,765.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.