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Finding the Fourth Proportional to 1,393,736.22, 1,923,171.80 and 781,865.51

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Solution

The fourth proportional to 1,393,736.22, 1,923,171.80 and 781,865.51 is: 1,078,871.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393,736.22 : 1,923,171.80 = 781,865.51 : x
  2. Step 2: Convert to fraction form
    1,393,736.22/1,923,171.80 = 781,865.51/x
  3. Step 3: Cross multiply
    1,393,736.22x = 1,923,171.80 × 781,865.51
  4. Step 4: Simplify right side
    1,393,736.22x = 1,503,661,686,699.43
  5. Step 5: Solve for x
    x = 1,503,661,686,699.43/1,393,736.22
  6. Step 6: Final answer
    x = 1,078,871.07

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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.