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Finding the Third Proportional to 31,210 and 47,212

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Solution

The third proportional to 31,210 and 47,212 is: 71,418.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,210 : 47,212 = 47,212 : x
  2. Step 2: Convert to fraction form
    31,210/47,212 = 47,212/x
  3. Step 3: Cross multiply
    31,210x = 47,212 × 47,212
  4. Step 4: Simplify right side
    31,210x = 2,228,972,944
  5. Step 5: Solve for x
    x = 2,228,972,944/31,210
  6. Step 6: Final answer
    x = 71,418.55

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.