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Finding the Third Proportional to 15,905 and 20,921.50

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Solution

The third proportional to 15,905 and 20,921.50 is: 27,520.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,905 : 20,921.50 = 20,921.50 : x
  2. Step 2: Convert to fraction form
    15,905/20,921.50 = 20,921.50/x
  3. Step 3: Cross multiply
    15,905x = 20,921.50 × 20,921.50
  4. Step 4: Simplify right side
    15,905x = 437,709,162.25
  5. Step 5: Solve for x
    x = 437,709,162.25/15,905
  6. Step 6: Final answer
    x = 27,520.22

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.