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Finding the Fourth Proportional to 408,907.20, 613,360.80 and 128,452.80

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Solution

The fourth proportional to 408,907.20, 613,360.80 and 128,452.80 is: 192,679.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,907.20 : 613,360.80 = 128,452.80 : x
  2. Step 2: Convert to fraction form
    408,907.20/613,360.80 = 128,452.80/x
  3. Step 3: Cross multiply
    408,907.20x = 613,360.80 × 128,452.80
  4. Step 4: Simplify right side
    408,907.20x = 78,787,912,170.24
  5. Step 5: Solve for x
    x = 78,787,912,170.24/408,907.20
  6. Step 6: Final answer
    x = 192,679.20

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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.