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Finding the Third Proportional to 30,690 and 66,210

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Solution

The third proportional to 30,690 and 66,210 is: 142,840.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,690 : 66,210 = 66,210 : x
  2. Step 2: Convert to fraction form
    30,690/66,210 = 66,210/x
  3. Step 3: Cross multiply
    30,690x = 66,210 × 66,210
  4. Step 4: Simplify right side
    30,690x = 4,383,764,100
  5. Step 5: Solve for x
    x = 4,383,764,100/30,690
  6. Step 6: Final answer
    x = 142,840.15

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.