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Finding the Third Proportional to 2,780 and 4,245

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Solution

The third proportional to 2,780 and 4,245 is: 6,482.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,780 : 4,245 = 4,245 : x
  2. Step 2: Convert to fraction form
    2,780/4,245 = 4,245/x
  3. Step 3: Cross multiply
    2,780x = 4,245 × 4,245
  4. Step 4: Simplify right side
    2,780x = 18,020,025
  5. Step 5: Solve for x
    x = 18,020,025/2,780
  6. Step 6: Final answer
    x = 6,482.02

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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.