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Finding the Third Proportional to 1,989 and 4,356

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Solution

The third proportional to 1,989 and 4,356 is: 9,539.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989 : 4,356 = 4,356 : x
  2. Step 2: Convert to fraction form
    1,989/4,356 = 4,356/x
  3. Step 3: Cross multiply
    1,989x = 4,356 × 4,356
  4. Step 4: Simplify right side
    1,989x = 18,974,736
  5. Step 5: Solve for x
    x = 18,974,736/1,989
  6. Step 6: Final answer
    x = 9,539.84

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.