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Finding the Third Proportional to 31,138.50 and 66,813

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Solution

The third proportional to 31,138.50 and 66,813 is: 143,358.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,138.50 : 66,813 = 66,813 : x
  2. Step 2: Convert to fraction form
    31,138.50/66,813 = 66,813/x
  3. Step 3: Cross multiply
    31,138.50x = 66,813 × 66,813
  4. Step 4: Simplify right side
    31,138.50x = 4,463,976,969
  5. Step 5: Solve for x
    x = 4,463,976,969/31,138.50
  6. Step 6: Final answer
    x = 143,358.77

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.