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Finding the Third Proportional to 31,511 and 69,239

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Solution

The third proportional to 31,511 and 69,239 is: 152,138.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,511 : 69,239 = 69,239 : x
  2. Step 2: Convert to fraction form
    31,511/69,239 = 69,239/x
  3. Step 3: Cross multiply
    31,511x = 69,239 × 69,239
  4. Step 4: Simplify right side
    31,511x = 4,794,039,121
  5. Step 5: Solve for x
    x = 4,794,039,121/31,511
  6. Step 6: Final answer
    x = 152,138.59

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.