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Finding the Third Proportional to 8,428 and 18,290

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Solution

The third proportional to 8,428 and 18,290 is: 39,691.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,428 : 18,290 = 18,290 : x
  2. Step 2: Convert to fraction form
    8,428/18,290 = 18,290/x
  3. Step 3: Cross multiply
    8,428x = 18,290 × 18,290
  4. Step 4: Simplify right side
    8,428x = 334,524,100
  5. Step 5: Solve for x
    x = 334,524,100/8,428
  6. Step 6: Final answer
    x = 39,691.99

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.