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Finding the Third Proportional to 21,438 and 31,317

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Solution

The third proportional to 21,438 and 31,317 is: 45,748.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,438 : 31,317 = 31,317 : x
  2. Step 2: Convert to fraction form
    21,438/31,317 = 31,317/x
  3. Step 3: Cross multiply
    21,438x = 31,317 × 31,317
  4. Step 4: Simplify right side
    21,438x = 980,754,489
  5. Step 5: Solve for x
    x = 980,754,489/21,438
  6. Step 6: Final answer
    x = 45,748.41

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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.