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Finding the Fourth Proportional to 408,728.92, 613,197.08 and 128,248.60

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Solution

The fourth proportional to 408,728.92, 613,197.08 and 128,248.60 is: 192,405.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,728.92 : 613,197.08 = 128,248.60 : x
  2. Step 2: Convert to fraction form
    408,728.92/613,197.08 = 128,248.60/x
  3. Step 3: Cross multiply
    408,728.92x = 613,197.08 × 128,248.60
  4. Step 4: Simplify right side
    408,728.92x = 78,641,667,034.09
  5. Step 5: Solve for x
    x = 78,641,667,034.09/408,728.92
  6. Step 6: Final answer
    x = 192,405.44

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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.