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Finding the Fourth Proportional to 408,966.20, 613,406.10 and 128,468.60

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Solution

The fourth proportional to 408,966.20, 613,406.10 and 128,468.60 is: 192,689.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,966.20 : 613,406.10 = 128,468.60 : x
  2. Step 2: Convert to fraction form
    408,966.20/613,406.10 = 128,468.60/x
  3. Step 3: Cross multiply
    408,966.20x = 613,406.10 × 128,468.60
  4. Step 4: Simplify right side
    408,966.20x = 78,803,422,898.46
  5. Step 5: Solve for x
    x = 78,803,422,898.46/408,966.20
  6. Step 6: Final answer
    x = 192,689.33

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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.