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Finding the Third Proportional to 64,486 and 91,329

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Solution

The third proportional to 64,486 and 91,329 is: 129,345.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,486 : 91,329 = 91,329 : x
  2. Step 2: Convert to fraction form
    64,486/91,329 = 91,329/x
  3. Step 3: Cross multiply
    64,486x = 91,329 × 91,329
  4. Step 4: Simplify right side
    64,486x = 8,340,986,241
  5. Step 5: Solve for x
    x = 8,340,986,241/64,486
  6. Step 6: Final answer
    x = 129,345.69

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.