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Finding the Fourth Proportional to 1,391,679, 1,920,517.02 and 788,183.64

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Solution

The fourth proportional to 1,391,679, 1,920,517.02 and 788,183.64 is: 1,087,693.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391,679 : 1,920,517.02 = 788,183.64 : x
  2. Step 2: Convert to fraction form
    1,391,679/1,920,517.02 = 788,183.64/x
  3. Step 3: Cross multiply
    1,391,679x = 1,920,517.02 × 788,183.64
  4. Step 4: Simplify right side
    1,391,679x = 1,513,720,095,505.55
  5. Step 5: Solve for x
    x = 1,513,720,095,505.55/1,391,679
  6. Step 6: Final answer
    x = 1,087,693.42

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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.