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Finding the Third Proportional to 206,356 and 311,615

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Solution

The third proportional to 206,356 and 311,615 is: 470,564.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,356 : 311,615 = 311,615 : x
  2. Step 2: Convert to fraction form
    206,356/311,615 = 311,615/x
  3. Step 3: Cross multiply
    206,356x = 311,615 × 311,615
  4. Step 4: Simplify right side
    206,356x = 97,103,908,225
  5. Step 5: Solve for x
    x = 97,103,908,225/206,356
  6. Step 6: Final answer
    x = 470,564.99

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.