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Finding the Third Proportional to 1,320 and 2,780

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Solution

The third proportional to 1,320 and 2,780 is: 5,854.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320 : 2,780 = 2,780 : x
  2. Step 2: Convert to fraction form
    1,320/2,780 = 2,780/x
  3. Step 3: Cross multiply
    1,320x = 2,780 × 2,780
  4. Step 4: Simplify right side
    1,320x = 7,728,400
  5. Step 5: Solve for x
    x = 7,728,400/1,320
  6. Step 6: Final answer
    x = 5,854.85

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.