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Finding the Fourth Proportional to 1,999.60, 3,005.88 and 1,989.88

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Solution

The fourth proportional to 1,999.60, 3,005.88 and 1,989.88 is: 2,991.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.60 : 3,005.88 = 1,989.88 : x
  2. Step 2: Convert to fraction form
    1,999.60/3,005.88 = 1,989.88/x
  3. Step 3: Cross multiply
    1,999.60x = 3,005.88 × 1,989.88
  4. Step 4: Simplify right side
    1,999.60x = 5,981,340.49
  5. Step 5: Solve for x
    x = 5,981,340.49/1,999.60
  6. Step 6: Final answer
    x = 2,991.27

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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.