Home / 639,400.78-882,380.40-352,921.09

Finding the Fourth Proportional to 639,400.78, 882,380.40 and 352,921.09

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Solution

The fourth proportional to 639,400.78, 882,380.40 and 352,921.09 is: 487,035.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,400.78 : 882,380.40 = 352,921.09 : x
  2. Step 2: Convert to fraction form
    639,400.78/882,380.40 = 352,921.09/x
  3. Step 3: Cross multiply
    639,400.78x = 882,380.40 × 352,921.09
  4. Step 4: Simplify right side
    639,400.78x = 311,410,652,562.64
  5. Step 5: Solve for x
    x = 311,410,652,562.64/639,400.78
  6. Step 6: Final answer
    x = 487,035.15

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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.