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Finding the Third Proportional to 30,387 and 66,318

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Solution

The third proportional to 30,387 and 66,318 is: 144,735.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,387 : 66,318 = 66,318 : x
  2. Step 2: Convert to fraction form
    30,387/66,318 = 66,318/x
  3. Step 3: Cross multiply
    30,387x = 66,318 × 66,318
  4. Step 4: Simplify right side
    30,387x = 4,398,077,124
  5. Step 5: Solve for x
    x = 4,398,077,124/30,387
  6. Step 6: Final answer
    x = 144,735.48

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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.