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Finding the Third Proportional to 1,289 and 1,970

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Solution

The third proportional to 1,289 and 1,970 is: 3,010.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289 : 1,970 = 1,970 : x
  2. Step 2: Convert to fraction form
    1,289/1,970 = 1,970/x
  3. Step 3: Cross multiply
    1,289x = 1,970 × 1,970
  4. Step 4: Simplify right side
    1,289x = 3,880,900
  5. Step 5: Solve for x
    x = 3,880,900/1,289
  6. Step 6: Final answer
    x = 3,010.78

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.