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Finding the Third Proportional to 311,942.63 and 638,666.25

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Solution

The third proportional to 311,942.63 and 638,666.25 is: 1,307,594.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    311,942.63 : 638,666.25 = 638,666.25 : x
  2. Step 2: Convert to fraction form
    311,942.63/638,666.25 = 638,666.25/x
  3. Step 3: Cross multiply
    311,942.63x = 638,666.25 × 638,666.25
  4. Step 4: Simplify right side
    311,942.63x = 407,894,578,889.06
  5. Step 5: Solve for x
    x = 407,894,578,889.06/311,942.63
  6. Step 6: Final answer
    x = 1,307,594.88

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.