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Finding the Third Proportional to 21,648 and 39,792

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Solution

The third proportional to 21,648 and 39,792 is: 73,143.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,648 : 39,792 = 39,792 : x
  2. Step 2: Convert to fraction form
    21,648/39,792 = 39,792/x
  3. Step 3: Cross multiply
    21,648x = 39,792 × 39,792
  4. Step 4: Simplify right side
    21,648x = 1,583,403,264
  5. Step 5: Solve for x
    x = 1,583,403,264/21,648
  6. Step 6: Final answer
    x = 73,143.17

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Why These Related Problems?

These problems maintain the same ratio (1.84) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.