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Finding the Third Proportional to 2,820 and 4,278

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Solution

The third proportional to 2,820 and 4,278 is: 6,489.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,820 : 4,278 = 4,278 : x
  2. Step 2: Convert to fraction form
    2,820/4,278 = 4,278/x
  3. Step 3: Cross multiply
    2,820x = 4,278 × 4,278
  4. Step 4: Simplify right side
    2,820x = 18,301,284
  5. Step 5: Solve for x
    x = 18,301,284/2,820
  6. Step 6: Final answer
    x = 6,489.82

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.