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Finding the Third Proportional to 11,559 and 15,421.50

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Solution

The third proportional to 11,559 and 15,421.50 is: 20,574.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,559 : 15,421.50 = 15,421.50 : x
  2. Step 2: Convert to fraction form
    11,559/15,421.50 = 15,421.50/x
  3. Step 3: Cross multiply
    11,559x = 15,421.50 × 15,421.50
  4. Step 4: Simplify right side
    11,559x = 237,822,662.25
  5. Step 5: Solve for x
    x = 237,822,662.25/11,559
  6. Step 6: Final answer
    x = 20,574.67

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.