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Finding the Third Proportional to 21,579 and 29,155

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Solution

The third proportional to 21,579 and 29,155 is: 39,390.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,579 : 29,155 = 29,155 : x
  2. Step 2: Convert to fraction form
    21,579/29,155 = 29,155/x
  3. Step 3: Cross multiply
    21,579x = 29,155 × 29,155
  4. Step 4: Simplify right side
    21,579x = 850,014,025
  5. Step 5: Solve for x
    x = 850,014,025/21,579
  6. Step 6: Final answer
    x = 39,390.80

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.