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Finding the Third Proportional to 7,809 and 12,420

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Solution

The third proportional to 7,809 and 12,420 is: 19,753.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,809 : 12,420 = 12,420 : x
  2. Step 2: Convert to fraction form
    7,809/12,420 = 12,420/x
  3. Step 3: Cross multiply
    7,809x = 12,420 × 12,420
  4. Step 4: Simplify right side
    7,809x = 154,256,400
  5. Step 5: Solve for x
    x = 154,256,400/7,809
  6. Step 6: Final answer
    x = 19,753.67

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.