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Finding the Third Proportional to 3,420.38 and 5,155.31

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Solution

The third proportional to 3,420.38 and 5,155.31 is: 7,770.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,420.38 : 5,155.31 = 5,155.31 : x
  2. Step 2: Convert to fraction form
    3,420.38/5,155.31 = 5,155.31/x
  3. Step 3: Cross multiply
    3,420.38x = 5,155.31 × 5,155.31
  4. Step 4: Simplify right side
    3,420.38x = 26,577,246.97
  5. Step 5: Solve for x
    x = 26,577,246.97/3,420.38
  6. Step 6: Final answer
    x = 7,770.27

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.