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Finding the Fourth Proportional to 428,791.82, 643,128.14 and 300,318.98

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Solution

The fourth proportional to 428,791.82, 643,128.14 and 300,318.98 is: 450,436.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,791.82 : 643,128.14 = 300,318.98 : x
  2. Step 2: Convert to fraction form
    428,791.82/643,128.14 = 300,318.98/x
  3. Step 3: Cross multiply
    428,791.82x = 643,128.14 × 300,318.98
  4. Step 4: Simplify right side
    428,791.82x = 193,143,587,014.10
  5. Step 5: Solve for x
    x = 193,143,587,014.10/428,791.82
  6. Step 6: Final answer
    x = 450,436.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.