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Finding the Fourth Proportional to 408,859.20, 613,288.80 and 198,907.20

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Solution

The fourth proportional to 408,859.20, 613,288.80 and 198,907.20 is: 298,360.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,859.20 : 613,288.80 = 198,907.20 : x
  2. Step 2: Convert to fraction form
    408,859.20/613,288.80 = 198,907.20/x
  3. Step 3: Cross multiply
    408,859.20x = 613,288.80 × 198,907.20
  4. Step 4: Simplify right side
    408,859.20x = 121,987,557,999.36
  5. Step 5: Solve for x
    x = 121,987,557,999.36/408,859.20
  6. Step 6: Final answer
    x = 298,360.80

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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.