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Finding the Third Proportional to 2,490 and 2,787

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Solution

The third proportional to 2,490 and 2,787 is: 3,119.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,490 : 2,787 = 2,787 : x
  2. Step 2: Convert to fraction form
    2,490/2,787 = 2,787/x
  3. Step 3: Cross multiply
    2,490x = 2,787 × 2,787
  4. Step 4: Simplify right side
    2,490x = 7,767,369
  5. Step 5: Solve for x
    x = 7,767,369/2,490
  6. Step 6: Final answer
    x = 3,119.43

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Why These Related Problems?

These problems maintain the same ratio (1.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.