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Finding the Third Proportional to 81,726 and 128,421

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Solution

The third proportional to 81,726 and 128,421 is: 201,795.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,726 : 128,421 = 128,421 : x
  2. Step 2: Convert to fraction form
    81,726/128,421 = 128,421/x
  3. Step 3: Cross multiply
    81,726x = 128,421 × 128,421
  4. Step 4: Simplify right side
    81,726x = 16,491,953,241
  5. Step 5: Solve for x
    x = 16,491,953,241/81,726
  6. Step 6: Final answer
    x = 201,795.67

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.