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Finding the Third Proportional to 313,860 and 402,990

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Solution

The third proportional to 313,860 and 402,990 is: 517,431.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    313,860 : 402,990 = 402,990 : x
  2. Step 2: Convert to fraction form
    313,860/402,990 = 402,990/x
  3. Step 3: Cross multiply
    313,860x = 402,990 × 402,990
  4. Step 4: Simplify right side
    313,860x = 162,400,940,100
  5. Step 5: Solve for x
    x = 162,400,940,100/313,860
  6. Step 6: Final answer
    x = 517,431.15

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.