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Finding the Third Proportional to 21,351.75 and 28,470

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Solution

The third proportional to 21,351.75 and 28,470 is: 37,961.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,351.75 : 28,470 = 28,470 : x
  2. Step 2: Convert to fraction form
    21,351.75/28,470 = 28,470/x
  3. Step 3: Cross multiply
    21,351.75x = 28,470 × 28,470
  4. Step 4: Simplify right side
    21,351.75x = 810,540,900
  5. Step 5: Solve for x
    x = 810,540,900/21,351.75
  6. Step 6: Final answer
    x = 37,961.33

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.