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Finding the Third Proportional to 909 and 1,213

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Solution

The third proportional to 909 and 1,213 is: 1,618.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    909 : 1,213 = 1,213 : x
  2. Step 2: Convert to fraction form
    909/1,213 = 1,213/x
  3. Step 3: Cross multiply
    909x = 1,213 × 1,213
  4. Step 4: Simplify right side
    909x = 1,471,369
  5. Step 5: Solve for x
    x = 1,471,369/909
  6. Step 6: Final answer
    x = 1,618.67

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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.