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Finding the Third Proportional to 100,872 and 217,140

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Solution

The third proportional to 100,872 and 217,140 is: 467,421.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,872 : 217,140 = 217,140 : x
  2. Step 2: Convert to fraction form
    100,872/217,140 = 217,140/x
  3. Step 3: Cross multiply
    100,872x = 217,140 × 217,140
  4. Step 4: Simplify right side
    100,872x = 47,149,779,600
  5. Step 5: Solve for x
    x = 47,149,779,600/100,872
  6. Step 6: Final answer
    x = 467,421.88

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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.