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Finding the Fourth Proportional to 408,940.20, 613,410.30 and 128,485.80

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Solution

The fourth proportional to 408,940.20, 613,410.30 and 128,485.80 is: 192,728.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,940.20 : 613,410.30 = 128,485.80 : x
  2. Step 2: Convert to fraction form
    408,940.20/613,410.30 = 128,485.80/x
  3. Step 3: Cross multiply
    408,940.20x = 613,410.30 × 128,485.80
  4. Step 4: Simplify right side
    408,940.20x = 78,814,513,123.74
  5. Step 5: Solve for x
    x = 78,814,513,123.74/408,940.20
  6. Step 6: Final answer
    x = 192,728.70

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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.