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Finding the Third Proportional to 31,719 and 47,211

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Solution

The third proportional to 31,719 and 47,211 is: 70,269.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,719 : 47,211 = 47,211 : x
  2. Step 2: Convert to fraction form
    31,719/47,211 = 47,211/x
  3. Step 3: Cross multiply
    31,719x = 47,211 × 47,211
  4. Step 4: Simplify right side
    31,719x = 2,228,878,521
  5. Step 5: Solve for x
    x = 2,228,878,521/31,719
  6. Step 6: Final answer
    x = 70,269.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.