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Finding the Third Proportional to 18,870 and 51,315

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Solution

The third proportional to 18,870 and 51,315 is: 139,545.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,870 : 51,315 = 51,315 : x
  2. Step 2: Convert to fraction form
    18,870/51,315 = 51,315/x
  3. Step 3: Cross multiply
    18,870x = 51,315 × 51,315
  4. Step 4: Simplify right side
    18,870x = 2,633,229,225
  5. Step 5: Solve for x
    x = 2,633,229,225/18,870
  6. Step 6: Final answer
    x = 139,545.80

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Why These Related Problems?

These problems maintain the same ratio (2.72) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.