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Finding the Fourth Proportional to 408,940.80, 613,430.40 and 128,467.20

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Solution

The fourth proportional to 408,940.80, 613,430.40 and 128,467.20 is: 192,706.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,940.80 : 613,430.40 = 128,467.20 : x
  2. Step 2: Convert to fraction form
    408,940.80/613,430.40 = 128,467.20/x
  3. Step 3: Cross multiply
    408,940.80x = 613,430.40 × 128,467.20
  4. Step 4: Simplify right side
    408,940.80x = 78,805,685,882.88
  5. Step 5: Solve for x
    x = 78,805,685,882.88/408,940.80
  6. Step 6: Final answer
    x = 192,706.83

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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.