Home / 428,794.21-643,284.20-129,249.73

Finding the Fourth Proportional to 428,794.21, 643,284.20 and 129,249.73

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Solution

The fourth proportional to 428,794.21, 643,284.20 and 129,249.73 is: 193,902.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,794.21 : 643,284.20 = 129,249.73 : x
  2. Step 2: Convert to fraction form
    428,794.21/643,284.20 = 129,249.73/x
  3. Step 3: Cross multiply
    428,794.21x = 643,284.20 × 129,249.73
  4. Step 4: Simplify right side
    428,794.21x = 83,144,309,163.27
  5. Step 5: Solve for x
    x = 83,144,309,163.27/428,794.21
  6. Step 6: Final answer
    x = 193,902.59

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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.