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Finding the Third Proportional to 30,979.50 and 66,885

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Solution

The third proportional to 30,979.50 and 66,885 is: 144,405.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,979.50 : 66,885 = 66,885 : x
  2. Step 2: Convert to fraction form
    30,979.50/66,885 = 66,885/x
  3. Step 3: Cross multiply
    30,979.50x = 66,885 × 66,885
  4. Step 4: Simplify right side
    30,979.50x = 4,473,603,225
  5. Step 5: Solve for x
    x = 4,473,603,225/30,979.50
  6. Step 6: Final answer
    x = 144,405.28

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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.