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Finding the Third Proportional to 18,315 and 39,221

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Solution

The third proportional to 18,315 and 39,221 is: 83,990.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,315 : 39,221 = 39,221 : x
  2. Step 2: Convert to fraction form
    18,315/39,221 = 39,221/x
  3. Step 3: Cross multiply
    18,315x = 39,221 × 39,221
  4. Step 4: Simplify right side
    18,315x = 1,538,286,841
  5. Step 5: Solve for x
    x = 1,538,286,841/18,315
  6. Step 6: Final answer
    x = 83,990.55

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.