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Finding the Fourth Proportional to 408,717.80, 613,095.90 and 128,244.20

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Solution

The fourth proportional to 408,717.80, 613,095.90 and 128,244.20 is: 192,372.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,717.80 : 613,095.90 = 128,244.20 : x
  2. Step 2: Convert to fraction form
    408,717.80/613,095.90 = 128,244.20/x
  3. Step 3: Cross multiply
    408,717.80x = 613,095.90 × 128,244.20
  4. Step 4: Simplify right side
    408,717.80x = 78,625,993,218.78
  5. Step 5: Solve for x
    x = 78,625,993,218.78/408,717.80
  6. Step 6: Final answer
    x = 192,372.32

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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.