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Finding the Third Proportional to 31,539 and 66,000

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Solution

The third proportional to 31,539 and 66,000 is: 138,114.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,539 : 66,000 = 66,000 : x
  2. Step 2: Convert to fraction form
    31,539/66,000 = 66,000/x
  3. Step 3: Cross multiply
    31,539x = 66,000 × 66,000
  4. Step 4: Simplify right side
    31,539x = 4,356,000,000
  5. Step 5: Solve for x
    x = 4,356,000,000/31,539
  6. Step 6: Final answer
    x = 138,114.72

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Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.