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Finding the Third Proportional to 66,999 and 90,991.50

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Solution

The third proportional to 66,999 and 90,991.50 is: 123,575.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,999 : 90,991.50 = 90,991.50 : x
  2. Step 2: Convert to fraction form
    66,999/90,991.50 = 90,991.50/x
  3. Step 3: Cross multiply
    66,999x = 90,991.50 × 90,991.50
  4. Step 4: Simplify right side
    66,999x = 8,279,453,072.25
  5. Step 5: Solve for x
    x = 8,279,453,072.25/66,999
  6. Step 6: Final answer
    x = 123,575.77

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.