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Finding the Third Proportional to 1,989.56 and 2,783.11

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Solution

The third proportional to 1,989.56 and 2,783.11 is: 3,893.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.56 : 2,783.11 = 2,783.11 : x
  2. Step 2: Convert to fraction form
    1,989.56/2,783.11 = 2,783.11/x
  3. Step 3: Cross multiply
    1,989.56x = 2,783.11 × 2,783.11
  4. Step 4: Simplify right side
    1,989.56x = 7,745,697.79
  5. Step 5: Solve for x
    x = 7,745,697.79/1,989.56
  6. Step 6: Final answer
    x = 3,893.17

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.