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Finding the Third Proportional to 18,763.50 and 31,278

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Solution

The third proportional to 18,763.50 and 31,278 is: 52,139.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,763.50 : 31,278 = 31,278 : x
  2. Step 2: Convert to fraction form
    18,763.50/31,278 = 31,278/x
  3. Step 3: Cross multiply
    18,763.50x = 31,278 × 31,278
  4. Step 4: Simplify right side
    18,763.50x = 978,313,284
  5. Step 5: Solve for x
    x = 978,313,284/18,763.50
  6. Step 6: Final answer
    x = 52,139.17

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Why These Related Problems?

These problems maintain the same ratio (1.67) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.