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Finding the Third Proportional to 28,401 and 39,720

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Solution

The third proportional to 28,401 and 39,720 is: 55,550.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,401 : 39,720 = 39,720 : x
  2. Step 2: Convert to fraction form
    28,401/39,720 = 39,720/x
  3. Step 3: Cross multiply
    28,401x = 39,720 × 39,720
  4. Step 4: Simplify right side
    28,401x = 1,577,678,400
  5. Step 5: Solve for x
    x = 1,577,678,400/28,401
  6. Step 6: Final answer
    x = 55,550.10

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.