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Finding the Fourth Proportional to 486,573.78, 728,843.57 and 391,289.54

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Solution

The fourth proportional to 486,573.78, 728,843.57 and 391,289.54 is: 586,116.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,573.78 : 728,843.57 = 391,289.54 : x
  2. Step 2: Convert to fraction form
    486,573.78/728,843.57 = 391,289.54/x
  3. Step 3: Cross multiply
    486,573.78x = 728,843.57 × 391,289.54
  4. Step 4: Simplify right side
    486,573.78x = 285,188,861,103.93
  5. Step 5: Solve for x
    x = 285,188,861,103.93/486,573.78
  6. Step 6: Final answer
    x = 586,116.37

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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.