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Finding the Third Proportional to 17,990 and 39,260

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Solution

The third proportional to 17,990 and 39,260 is: 85,678.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,990 : 39,260 = 39,260 : x
  2. Step 2: Convert to fraction form
    17,990/39,260 = 39,260/x
  3. Step 3: Cross multiply
    17,990x = 39,260 × 39,260
  4. Step 4: Simplify right side
    17,990x = 1,541,347,600
  5. Step 5: Solve for x
    x = 1,541,347,600/17,990
  6. Step 6: Final answer
    x = 85,678.02

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.