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Finding the Fourth Proportional to 2,728.98, 4,091.49 and 879.03

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Solution

The fourth proportional to 2,728.98, 4,091.49 and 879.03 is: 1,317.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,728.98 : 4,091.49 = 879.03 : x
  2. Step 2: Convert to fraction form
    2,728.98/4,091.49 = 879.03/x
  3. Step 3: Cross multiply
    2,728.98x = 4,091.49 × 879.03
  4. Step 4: Simplify right side
    2,728.98x = 3,596,542.45
  5. Step 5: Solve for x
    x = 3,596,542.45/2,728.98
  6. Step 6: Final answer
    x = 1,317.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.