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Finding the Fourth Proportional to 408,716.80, 613,094.40 and 128,243.20

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Solution

The fourth proportional to 408,716.80, 613,094.40 and 128,243.20 is: 192,370.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,716.80 : 613,094.40 = 128,243.20 : x
  2. Step 2: Convert to fraction form
    408,716.80/613,094.40 = 128,243.20/x
  3. Step 3: Cross multiply
    408,716.80x = 613,094.40 × 128,243.20
  4. Step 4: Simplify right side
    408,716.80x = 78,625,187,758.08
  5. Step 5: Solve for x
    x = 78,625,187,758.08/408,716.80
  6. Step 6: Final answer
    x = 192,370.82

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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.