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Finding the Fourth Proportional to 408,616.40, 612,924.60 and 128,133.20

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Solution

The fourth proportional to 408,616.40, 612,924.60 and 128,133.20 is: 192,199.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,616.40 : 612,924.60 = 128,133.20 : x
  2. Step 2: Convert to fraction form
    408,616.40/612,924.60 = 128,133.20/x
  3. Step 3: Cross multiply
    408,616.40x = 612,924.60 × 128,133.20
  4. Step 4: Simplify right side
    408,616.40x = 78,535,990,356.72
  5. Step 5: Solve for x
    x = 78,535,990,356.72/408,616.40
  6. Step 6: Final answer
    x = 192,199.80

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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.