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Finding the Third Proportional to 2,490 and 5,438

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Solution

The third proportional to 2,490 and 5,438 is: 11,876.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,490 : 5,438 = 5,438 : x
  2. Step 2: Convert to fraction form
    2,490/5,438 = 5,438/x
  3. Step 3: Cross multiply
    2,490x = 5,438 × 5,438
  4. Step 4: Simplify right side
    2,490x = 29,571,844
  5. Step 5: Solve for x
    x = 29,571,844/2,490
  6. Step 6: Final answer
    x = 11,876.24

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.