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Finding the Third Proportional to 5,218 and 8,290

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Solution

The third proportional to 5,218 and 8,290 is: 13,170.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,218 : 8,290 = 8,290 : x
  2. Step 2: Convert to fraction form
    5,218/8,290 = 8,290/x
  3. Step 3: Cross multiply
    5,218x = 8,290 × 8,290
  4. Step 4: Simplify right side
    5,218x = 68,724,100
  5. Step 5: Solve for x
    x = 68,724,100/5,218
  6. Step 6: Final answer
    x = 13,170.58

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.