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Finding the Fourth Proportional to 1,379,979.08, 1,904,370.87 and 768,118.73

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Solution

The fourth proportional to 1,379,979.08, 1,904,370.87 and 768,118.73 is: 1,060,003.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379,979.08 : 1,904,370.87 = 768,118.73 : x
  2. Step 2: Convert to fraction form
    1,379,979.08/1,904,370.87 = 768,118.73/x
  3. Step 3: Cross multiply
    1,379,979.08x = 1,904,370.87 × 768,118.73
  4. Step 4: Simplify right side
    1,379,979.08x = 1,462,782,934,113.40
  5. Step 5: Solve for x
    x = 1,462,782,934,113.40/1,379,979.08
  6. Step 6: Final answer
    x = 1,060,003.70

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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.