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Finding the Third Proportional to 6,990 and 8,478

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Solution

The third proportional to 6,990 and 8,478 is: 10,282.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,990 : 8,478 = 8,478 : x
  2. Step 2: Convert to fraction form
    6,990/8,478 = 8,478/x
  3. Step 3: Cross multiply
    6,990x = 8,478 × 8,478
  4. Step 4: Simplify right side
    6,990x = 71,876,484
  5. Step 5: Solve for x
    x = 71,876,484/6,990
  6. Step 6: Final answer
    x = 10,282.76

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Why These Related Problems?

These problems maintain the same ratio (1.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.