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Finding the Third Proportional to 1,320 and 2,781.75

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Solution

The third proportional to 1,320 and 2,781.75 is: 5,862.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320 : 2,781.75 = 2,781.75 : x
  2. Step 2: Convert to fraction form
    1,320/2,781.75 = 2,781.75/x
  3. Step 3: Cross multiply
    1,320x = 2,781.75 × 2,781.75
  4. Step 4: Simplify right side
    1,320x = 7,738,133.06
  5. Step 5: Solve for x
    x = 7,738,133.06/1,320
  6. Step 6: Final answer
    x = 5,862.22

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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.