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Finding the Third Proportional to 30,720 and 66,903

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Solution

The third proportional to 30,720 and 66,903 is: 145,703.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,720 : 66,903 = 66,903 : x
  2. Step 2: Convert to fraction form
    30,720/66,903 = 66,903/x
  3. Step 3: Cross multiply
    30,720x = 66,903 × 66,903
  4. Step 4: Simplify right side
    30,720x = 4,476,011,409
  5. Step 5: Solve for x
    x = 4,476,011,409/30,720
  6. Step 6: Final answer
    x = 145,703.50

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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.