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Finding the Third Proportional to 5,643 and 10,989

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Solution

The third proportional to 5,643 and 10,989 is: 21,399.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,643 : 10,989 = 10,989 : x
  2. Step 2: Convert to fraction form
    5,643/10,989 = 10,989/x
  3. Step 3: Cross multiply
    5,643x = 10,989 × 10,989
  4. Step 4: Simplify right side
    5,643x = 120,758,121
  5. Step 5: Solve for x
    x = 120,758,121/5,643
  6. Step 6: Final answer
    x = 21,399.63

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Why These Related Problems?

These problems maintain the same ratio (1.95) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.