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Finding the Third Proportional to 18,117 and 20,911.50

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Solution

The third proportional to 18,117 and 20,911.50 is: 24,137.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,117 : 20,911.50 = 20,911.50 : x
  2. Step 2: Convert to fraction form
    18,117/20,911.50 = 20,911.50/x
  3. Step 3: Cross multiply
    18,117x = 20,911.50 × 20,911.50
  4. Step 4: Simplify right side
    18,117x = 437,290,832.25
  5. Step 5: Solve for x
    x = 437,290,832.25/18,117
  6. Step 6: Final answer
    x = 24,137.04

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.