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Finding the Third Proportional to 21,420 and 31,293

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Solution

The third proportional to 21,420 and 31,293 is: 45,716.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,420 : 31,293 = 31,293 : x
  2. Step 2: Convert to fraction form
    21,420/31,293 = 31,293/x
  3. Step 3: Cross multiply
    21,420x = 31,293 × 31,293
  4. Step 4: Simplify right side
    21,420x = 979,251,849
  5. Step 5: Solve for x
    x = 979,251,849/21,420
  6. Step 6: Final answer
    x = 45,716.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.