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Finding the Fourth Proportional to 639,410.31, 882,407.60 and 349,039.09

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Solution

The fourth proportional to 639,410.31, 882,407.60 and 349,039.09 is: 481,685.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,410.31 : 882,407.60 = 349,039.09 : x
  2. Step 2: Convert to fraction form
    639,410.31/882,407.60 = 349,039.09/x
  3. Step 3: Cross multiply
    639,410.31x = 882,407.60 × 349,039.09
  4. Step 4: Simplify right side
    639,410.31x = 307,994,745,713.08
  5. Step 5: Solve for x
    x = 307,994,745,713.08/639,410.31
  6. Step 6: Final answer
    x = 481,685.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.