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Finding the Fourth Proportional to 398,907.48, 550,481.42 and 217,619.36

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Solution

The fourth proportional to 398,907.48, 550,481.42 and 217,619.36 is: 300,308.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,907.48 : 550,481.42 = 217,619.36 : x
  2. Step 2: Convert to fraction form
    398,907.48/550,481.42 = 217,619.36/x
  3. Step 3: Cross multiply
    398,907.48x = 550,481.42 × 217,619.36
  4. Step 4: Simplify right side
    398,907.48x = 119,795,412,589.66
  5. Step 5: Solve for x
    x = 119,795,412,589.66/398,907.48
  6. Step 6: Final answer
    x = 300,308.77

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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.