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Finding the Third Proportional to 309,690 and 678,429

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Solution

The third proportional to 309,690 and 678,429 is: 1,486,214.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,690 : 678,429 = 678,429 : x
  2. Step 2: Convert to fraction form
    309,690/678,429 = 678,429/x
  3. Step 3: Cross multiply
    309,690x = 678,429 × 678,429
  4. Step 4: Simplify right side
    309,690x = 460,265,908,041
  5. Step 5: Solve for x
    x = 460,265,908,041/309,690
  6. Step 6: Final answer
    x = 1,486,214.95

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.