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Finding the Third Proportional to 18,520 and 39,960

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Solution

The third proportional to 18,520 and 39,960 is: 86,220.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,520 : 39,960 = 39,960 : x
  2. Step 2: Convert to fraction form
    18,520/39,960 = 39,960/x
  3. Step 3: Cross multiply
    18,520x = 39,960 × 39,960
  4. Step 4: Simplify right side
    18,520x = 1,596,801,600
  5. Step 5: Solve for x
    x = 1,596,801,600/18,520
  6. Step 6: Final answer
    x = 86,220.39

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.