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Finding the Third Proportional to 1,270.75 and 2,789

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Solution

The third proportional to 1,270.75 and 2,789 is: 6,121.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.75 : 2,789 = 2,789 : x
  2. Step 2: Convert to fraction form
    1,270.75/2,789 = 2,789/x
  3. Step 3: Cross multiply
    1,270.75x = 2,789 × 2,789
  4. Step 4: Simplify right side
    1,270.75x = 7,778,521
  5. Step 5: Solve for x
    x = 7,778,521/1,270.75
  6. Step 6: Final answer
    x = 6,121.20

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.