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Finding the Third Proportional to 30,905 and 67,318

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Solution

The third proportional to 30,905 and 67,318 is: 146,633.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,905 : 67,318 = 67,318 : x
  2. Step 2: Convert to fraction form
    30,905/67,318 = 67,318/x
  3. Step 3: Cross multiply
    30,905x = 67,318 × 67,318
  4. Step 4: Simplify right side
    30,905x = 4,531,713,124
  5. Step 5: Solve for x
    x = 4,531,713,124/30,905
  6. Step 6: Final answer
    x = 146,633.66

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.