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Finding the Fourth Proportional to 408,883.14, 613,423.53 and 128,400.39

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Solution

The fourth proportional to 408,883.14, 613,423.53 and 128,400.39 is: 192,631.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,883.14 : 613,423.53 = 128,400.39 : x
  2. Step 2: Convert to fraction form
    408,883.14/613,423.53 = 128,400.39/x
  3. Step 3: Cross multiply
    408,883.14x = 613,423.53 × 128,400.39
  4. Step 4: Simplify right side
    408,883.14x = 78,763,820,487.18
  5. Step 5: Solve for x
    x = 78,763,820,487.18/408,883.14
  6. Step 6: Final answer
    x = 192,631.62

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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.