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Finding the Fourth Proportional to 6,606, 9,909 and 1,989

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Solution

The fourth proportional to 6,606, 9,909 and 1,989 is: 2,983.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,606 : 9,909 = 1,989 : x
  2. Step 2: Convert to fraction form
    6,606/9,909 = 1,989/x
  3. Step 3: Cross multiply
    6,606x = 9,909 × 1,989
  4. Step 4: Simplify right side
    6,606x = 19,709,001
  5. Step 5: Solve for x
    x = 19,709,001/6,606
  6. Step 6: Final answer
    x = 2,983.50

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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.