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Finding the Third Proportional to 8,424 and 12,840

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Solution

The third proportional to 8,424 and 12,840 is: 19,570.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,424 : 12,840 = 12,840 : x
  2. Step 2: Convert to fraction form
    8,424/12,840 = 12,840/x
  3. Step 3: Cross multiply
    8,424x = 12,840 × 12,840
  4. Step 4: Simplify right side
    8,424x = 164,865,600
  5. Step 5: Solve for x
    x = 164,865,600/8,424
  6. Step 6: Final answer
    x = 19,570.94

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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.