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Finding the Third Proportional to 985 and 2,113

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Solution

The third proportional to 985 and 2,113 is: 4,532.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    985 : 2,113 = 2,113 : x
  2. Step 2: Convert to fraction form
    985/2,113 = 2,113/x
  3. Step 3: Cross multiply
    985x = 2,113 × 2,113
  4. Step 4: Simplify right side
    985x = 4,464,769
  5. Step 5: Solve for x
    x = 4,464,769/985
  6. Step 6: Final answer
    x = 4,532.76

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.