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Finding the Fourth Proportional to 715,917.92, 987,945.84 and 393,627.68

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Solution

The fourth proportional to 715,917.92, 987,945.84 and 393,627.68 is: 543,194.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,917.92 : 987,945.84 = 393,627.68 : x
  2. Step 2: Convert to fraction form
    715,917.92/987,945.84 = 393,627.68/x
  3. Step 3: Cross multiply
    715,917.92x = 987,945.84 × 393,627.68
  4. Step 4: Simplify right side
    715,917.92x = 388,882,828,964.85
  5. Step 5: Solve for x
    x = 388,882,828,964.85/715,917.92
  6. Step 6: Final answer
    x = 543,194.71

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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.