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Finding the Third Proportional to 989 and 2,099.75

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Solution

The third proportional to 989 and 2,099.75 is: 4,457.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    989 : 2,099.75 = 2,099.75 : x
  2. Step 2: Convert to fraction form
    989/2,099.75 = 2,099.75/x
  3. Step 3: Cross multiply
    989x = 2,099.75 × 2,099.75
  4. Step 4: Simplify right side
    989x = 4,408,950.06
  5. Step 5: Solve for x
    x = 4,408,950.06/989
  6. Step 6: Final answer
    x = 4,457.99

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.