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Finding the Third Proportional to 3,490 and 7,890

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Solution

The third proportional to 3,490 and 7,890 is: 17,837.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,490 : 7,890 = 7,890 : x
  2. Step 2: Convert to fraction form
    3,490/7,890 = 7,890/x
  3. Step 3: Cross multiply
    3,490x = 7,890 × 7,890
  4. Step 4: Simplify right side
    3,490x = 62,252,100
  5. Step 5: Solve for x
    x = 62,252,100/3,490
  6. Step 6: Final answer
    x = 17,837.28

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Why These Related Problems?

These problems maintain the same ratio (2.26) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.