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Finding the Third Proportional to 138,213 and 211,687.50

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Solution

The third proportional to 138,213 and 211,687.50 is: 324,221.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,213 : 211,687.50 = 211,687.50 : x
  2. Step 2: Convert to fraction form
    138,213/211,687.50 = 211,687.50/x
  3. Step 3: Cross multiply
    138,213x = 211,687.50 × 211,687.50
  4. Step 4: Simplify right side
    138,213x = 44,811,597,656.25
  5. Step 5: Solve for x
    x = 44,811,597,656.25/138,213
  6. Step 6: Final answer
    x = 324,221.29

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.