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Finding the Third Proportional to 312,408 and 681,354

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Solution

The third proportional to 312,408 and 681,354 is: 1,486,015.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,408 : 681,354 = 681,354 : x
  2. Step 2: Convert to fraction form
    312,408/681,354 = 681,354/x
  3. Step 3: Cross multiply
    312,408x = 681,354 × 681,354
  4. Step 4: Simplify right side
    312,408x = 464,243,273,316
  5. Step 5: Solve for x
    x = 464,243,273,316/312,408
  6. Step 6: Final answer
    x = 1,486,015.96

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.