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Finding the Third Proportional to 19,509.75 and 21,129.75

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Solution

The third proportional to 19,509.75 and 21,129.75 is: 22,884.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,509.75 : 21,129.75 = 21,129.75 : x
  2. Step 2: Convert to fraction form
    19,509.75/21,129.75 = 21,129.75/x
  3. Step 3: Cross multiply
    19,509.75x = 21,129.75 × 21,129.75
  4. Step 4: Simplify right side
    19,509.75x = 446,466,335.06
  5. Step 5: Solve for x
    x = 446,466,335.06/19,509.75
  6. Step 6: Final answer
    x = 22,884.27

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.