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Finding the Fourth Proportional to 2,999.78, 4,138.41 and 1,879.95

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Solution

The fourth proportional to 2,999.78, 4,138.41 and 1,879.95 is: 2,593.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,999.78 : 4,138.41 = 1,879.95 : x
  2. Step 2: Convert to fraction form
    2,999.78/4,138.41 = 1,879.95/x
  3. Step 3: Cross multiply
    2,999.78x = 4,138.41 × 1,879.95
  4. Step 4: Simplify right side
    2,999.78x = 7,780,003.88
  5. Step 5: Solve for x
    x = 7,780,003.88/2,999.78
  6. Step 6: Final answer
    x = 2,593.53

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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.