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Finding the Third Proportional to 9,489 and 12,421.50

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Solution

The third proportional to 9,489 and 12,421.50 is: 16,260.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,489 : 12,421.50 = 12,421.50 : x
  2. Step 2: Convert to fraction form
    9,489/12,421.50 = 12,421.50/x
  3. Step 3: Cross multiply
    9,489x = 12,421.50 × 12,421.50
  4. Step 4: Simplify right side
    9,489x = 154,293,662.25
  5. Step 5: Solve for x
    x = 154,293,662.25/9,489
  6. Step 6: Final answer
    x = 16,260.27

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.