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Finding the Third Proportional to 81,315 and 129,492

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Solution

The third proportional to 81,315 and 129,492 is: 206,212.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,315 : 129,492 = 129,492 : x
  2. Step 2: Convert to fraction form
    81,315/129,492 = 129,492/x
  3. Step 3: Cross multiply
    81,315x = 129,492 × 129,492
  4. Step 4: Simplify right side
    81,315x = 16,768,178,064
  5. Step 5: Solve for x
    x = 16,768,178,064/81,315
  6. Step 6: Final answer
    x = 206,212.61

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.