Home / 428,103.45-641,706.84-143,724.20

Finding the Fourth Proportional to 428,103.45, 641,706.84 and 143,724.20

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Solution

The fourth proportional to 428,103.45, 641,706.84 and 143,724.20 is: 215,435.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,103.45 : 641,706.84 = 143,724.20 : x
  2. Step 2: Convert to fraction form
    428,103.45/641,706.84 = 143,724.20/x
  3. Step 3: Cross multiply
    428,103.45x = 641,706.84 × 143,724.20
  4. Step 4: Simplify right side
    428,103.45x = 92,228,799,004.99
  5. Step 5: Solve for x
    x = 92,228,799,004.99/428,103.45
  6. Step 6: Final answer
    x = 215,435.78

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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.