Home / 678,404.12-936,635.79-420,556.61

Finding the Fourth Proportional to 678,404.12, 936,635.79 and 420,556.61

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Solution

The fourth proportional to 678,404.12, 936,635.79 and 420,556.61 is: 580,639.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,404.12 : 936,635.79 = 420,556.61 : x
  2. Step 2: Convert to fraction form
    678,404.12/936,635.79 = 420,556.61/x
  3. Step 3: Cross multiply
    678,404.12x = 936,635.79 × 420,556.61
  4. Step 4: Simplify right side
    678,404.12x = 393,908,367,963.89
  5. Step 5: Solve for x
    x = 393,908,367,963.89/678,404.12
  6. Step 6: Final answer
    x = 580,639.71

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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.