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Finding the Fourth Proportional to 1,999.21, 2,998.68 and 612.41

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Solution

The fourth proportional to 1,999.21, 2,998.68 and 612.41 is: 918.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.21 : 2,998.68 = 612.41 : x
  2. Step 2: Convert to fraction form
    1,999.21/2,998.68 = 612.41/x
  3. Step 3: Cross multiply
    1,999.21x = 2,998.68 × 612.41
  4. Step 4: Simplify right side
    1,999.21x = 1,836,431.41
  5. Step 5: Solve for x
    x = 1,836,431.41/1,999.21
  6. Step 6: Final answer
    x = 918.58

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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.