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Finding the Fourth Proportional to 257,843.70, 355,818.78 and 143,115.66

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Solution

The fourth proportional to 257,843.70, 355,818.78 and 143,115.66 is: 197,496.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,843.70 : 355,818.78 = 143,115.66 : x
  2. Step 2: Convert to fraction form
    257,843.70/355,818.78 = 143,115.66/x
  3. Step 3: Cross multiply
    257,843.70x = 355,818.78 × 143,115.66
  4. Step 4: Simplify right side
    257,843.70x = 50,923,239,540.09
  5. Step 5: Solve for x
    x = 50,923,239,540.09/257,843.70
  6. Step 6: Final answer
    x = 197,496.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.