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Finding the Third Proportional to 8,430 and 12,761

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Solution

The third proportional to 8,430 and 12,761 is: 19,317.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,430 : 12,761 = 12,761 : x
  2. Step 2: Convert to fraction form
    8,430/12,761 = 12,761/x
  3. Step 3: Cross multiply
    8,430x = 12,761 × 12,761
  4. Step 4: Simplify right side
    8,430x = 162,843,121
  5. Step 5: Solve for x
    x = 162,843,121/8,430
  6. Step 6: Final answer
    x = 19,317.10

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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.