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Finding the Third Proportional to 100,405 and 216,361

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Solution

The third proportional to 100,405 and 216,361 is: 466,232.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,405 : 216,361 = 216,361 : x
  2. Step 2: Convert to fraction form
    100,405/216,361 = 216,361/x
  3. Step 3: Cross multiply
    100,405x = 216,361 × 216,361
  4. Step 4: Simplify right side
    100,405x = 46,812,082,321
  5. Step 5: Solve for x
    x = 46,812,082,321/100,405
  6. Step 6: Final answer
    x = 466,232.58

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.