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Finding the Fourth Proportional to 1,379,961.80, 1,904,368.82 and 768,121.21

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Solution

The fourth proportional to 1,379,961.80, 1,904,368.82 and 768,121.21 is: 1,060,019.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379,961.80 : 1,904,368.82 = 768,121.21 : x
  2. Step 2: Convert to fraction form
    1,379,961.80/1,904,368.82 = 768,121.21/x
  3. Step 3: Cross multiply
    1,379,961.80x = 1,904,368.82 × 768,121.21
  4. Step 4: Simplify right side
    1,379,961.80x = 1,462,786,082,304.67
  5. Step 5: Solve for x
    x = 1,462,786,082,304.67/1,379,961.80
  6. Step 6: Final answer
    x = 1,060,019.26

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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.