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Finding the Third Proportional to 3,100.78 and 6,421.78

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Solution

The third proportional to 3,100.78 and 6,421.78 is: 13,299.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,100.78 : 6,421.78 = 6,421.78 : x
  2. Step 2: Convert to fraction form
    3,100.78/6,421.78 = 6,421.78/x
  3. Step 3: Cross multiply
    3,100.78x = 6,421.78 × 6,421.78
  4. Step 4: Simplify right side
    3,100.78x = 41,239,274.42
  5. Step 5: Solve for x
    x = 41,239,274.42/3,100.78
  6. Step 6: Final answer
    x = 13,299.64

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Why These Related Problems?

These problems maintain the same ratio (2.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.