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Finding the Third Proportional to 979 and 1,389

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Solution

The third proportional to 979 and 1,389 is: 1,970.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    979 : 1,389 = 1,389 : x
  2. Step 2: Convert to fraction form
    979/1,389 = 1,389/x
  3. Step 3: Cross multiply
    979x = 1,389 × 1,389
  4. Step 4: Simplify right side
    979x = 1,929,321
  5. Step 5: Solve for x
    x = 1,929,321/979
  6. Step 6: Final answer
    x = 1,970.71

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.