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Finding the Third Proportional to 31,239 and 66,939.75

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Solution

The third proportional to 31,239 and 66,939.75 is: 143,440.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,239 : 66,939.75 = 66,939.75 : x
  2. Step 2: Convert to fraction form
    31,239/66,939.75 = 66,939.75/x
  3. Step 3: Cross multiply
    31,239x = 66,939.75 × 66,939.75
  4. Step 4: Simplify right side
    31,239x = 4,480,930,130.06
  5. Step 5: Solve for x
    x = 4,480,930,130.06/31,239
  6. Step 6: Final answer
    x = 143,440.26

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Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.