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Finding the Third Proportional to 7,856 and 8,480

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Solution

The third proportional to 7,856 and 8,480 is: 9,153.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,856 : 8,480 = 8,480 : x
  2. Step 2: Convert to fraction form
    7,856/8,480 = 8,480/x
  3. Step 3: Cross multiply
    7,856x = 8,480 × 8,480
  4. Step 4: Simplify right side
    7,856x = 71,910,400
  5. Step 5: Solve for x
    x = 71,910,400/7,856
  6. Step 6: Final answer
    x = 9,153.56

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.