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Finding the Fourth Proportional to 1,379,968.28, 1,904,313.83 and 768,105.30

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Solution

The fourth proportional to 1,379,968.28, 1,904,313.83 and 768,105.30 is: 1,059,961.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379,968.28 : 1,904,313.83 = 768,105.30 : x
  2. Step 2: Convert to fraction form
    1,379,968.28/1,904,313.83 = 768,105.30/x
  3. Step 3: Cross multiply
    1,379,968.28x = 1,904,313.83 × 768,105.30
  4. Step 4: Simplify right side
    1,379,968.28x = 1,462,713,542,595.78
  5. Step 5: Solve for x
    x = 1,462,713,542,595.78/1,379,968.28
  6. Step 6: Final answer
    x = 1,059,961.71

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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.