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Finding the Third Proportional to 66,420 and 145,800

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Solution

The third proportional to 66,420 and 145,800 is: 320,048.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,420 : 145,800 = 145,800 : x
  2. Step 2: Convert to fraction form
    66,420/145,800 = 145,800/x
  3. Step 3: Cross multiply
    66,420x = 145,800 × 145,800
  4. Step 4: Simplify right side
    66,420x = 21,257,640,000
  5. Step 5: Solve for x
    x = 21,257,640,000/66,420
  6. Step 6: Final answer
    x = 320,048.78

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.