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Finding the Fourth Proportional to 408,862.69, 613,299.50 and 128,379.94

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Solution

The fourth proportional to 408,862.69, 613,299.50 and 128,379.94 is: 192,571.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,862.69 : 613,299.50 = 128,379.94 : x
  2. Step 2: Convert to fraction form
    408,862.69/613,299.50 = 128,379.94/x
  3. Step 3: Cross multiply
    408,862.69x = 613,299.50 × 128,379.94
  4. Step 4: Simplify right side
    408,862.69x = 78,735,351,318.31
  5. Step 5: Solve for x
    x = 78,735,351,318.31/408,862.69
  6. Step 6: Final answer
    x = 192,571.62

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1.5x scale

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.