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Finding the Third Proportional to 2,890 and 3,130

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Solution

The third proportional to 2,890 and 3,130 is: 3,389.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,890 : 3,130 = 3,130 : x
  2. Step 2: Convert to fraction form
    2,890/3,130 = 3,130/x
  3. Step 3: Cross multiply
    2,890x = 3,130 × 3,130
  4. Step 4: Simplify right side
    2,890x = 9,796,900
  5. Step 5: Solve for x
    x = 9,796,900/2,890
  6. Step 6: Final answer
    x = 3,389.93

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.