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Finding the Third Proportional to 311,128.88 and 678,570.75

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Solution

The third proportional to 311,128.88 and 678,570.75 is: 1,479,959.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    311,128.88 : 678,570.75 = 678,570.75 : x
  2. Step 2: Convert to fraction form
    311,128.88/678,570.75 = 678,570.75/x
  3. Step 3: Cross multiply
    311,128.88x = 678,570.75 × 678,570.75
  4. Step 4: Simplify right side
    311,128.88x = 460,458,262,755.56
  5. Step 5: Solve for x
    x = 460,458,262,755.56/311,128.88
  6. Step 6: Final answer
    x = 1,479,959.91

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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.