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Finding the Third Proportional to 21,520 and 43,904

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Solution

The third proportional to 21,520 and 43,904 is: 89,570.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,520 : 43,904 = 43,904 : x
  2. Step 2: Convert to fraction form
    21,520/43,904 = 43,904/x
  3. Step 3: Cross multiply
    21,520x = 43,904 × 43,904
  4. Step 4: Simplify right side
    21,520x = 1,927,561,216
  5. Step 5: Solve for x
    x = 1,927,561,216/21,520
  6. Step 6: Final answer
    x = 89,570.69

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Why These Related Problems?

These problems maintain the same ratio (2.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.