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Finding the Fourth Proportional to 1,999.85, 2,759.85 and 1,115.64

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Solution

The fourth proportional to 1,999.85, 2,759.85 and 1,115.64 is: 1,539.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.85 : 2,759.85 = 1,115.64 : x
  2. Step 2: Convert to fraction form
    1,999.85/2,759.85 = 1,115.64/x
  3. Step 3: Cross multiply
    1,999.85x = 2,759.85 × 1,115.64
  4. Step 4: Simplify right side
    1,999.85x = 3,078,999.05
  5. Step 5: Solve for x
    x = 3,078,999.05/1,999.85
  6. Step 6: Final answer
    x = 1,539.62

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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.