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Finding the Third Proportional to 312,819 and 687,846

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Solution

The third proportional to 312,819 and 687,846 is: 1,512,478.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,819 : 687,846 = 687,846 : x
  2. Step 2: Convert to fraction form
    312,819/687,846 = 687,846/x
  3. Step 3: Cross multiply
    312,819x = 687,846 × 687,846
  4. Step 4: Simplify right side
    312,819x = 473,132,119,716
  5. Step 5: Solve for x
    x = 473,132,119,716/312,819
  6. Step 6: Final answer
    x = 1,512,478.84

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.