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Finding the Third Proportional to 21,521 and 31,425

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Solution

The third proportional to 21,521 and 31,425 is: 45,886.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,521 : 31,425 = 31,425 : x
  2. Step 2: Convert to fraction form
    21,521/31,425 = 31,425/x
  3. Step 3: Cross multiply
    21,521x = 31,425 × 31,425
  4. Step 4: Simplify right side
    21,521x = 987,530,625
  5. Step 5: Solve for x
    x = 987,530,625/21,521
  6. Step 6: Final answer
    x = 45,886.84

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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.