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Finding the Fourth Proportional to 394,668.56, 591,868.72 and 128,362.98

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Solution

The fourth proportional to 394,668.56, 591,868.72 and 128,362.98 is: 192,500.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,668.56 : 591,868.72 = 128,362.98 : x
  2. Step 2: Convert to fraction form
    394,668.56/591,868.72 = 128,362.98/x
  3. Step 3: Cross multiply
    394,668.56x = 591,868.72 × 128,362.98
  4. Step 4: Simplify right side
    394,668.56x = 75,974,032,667.99
  5. Step 5: Solve for x
    x = 75,974,032,667.99/394,668.56
  6. Step 6: Final answer
    x = 192,500.85

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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.