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Finding the Fourth Proportional to 621,087.52, 856,963.92 and 395,065.12

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Solution

The fourth proportional to 621,087.52, 856,963.92 and 395,065.12 is: 545,102.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,087.52 : 856,963.92 = 395,065.12 : x
  2. Step 2: Convert to fraction form
    621,087.52/856,963.92 = 395,065.12/x
  3. Step 3: Cross multiply
    621,087.52x = 856,963.92 × 395,065.12
  4. Step 4: Simplify right side
    621,087.52x = 338,556,553,890.47
  5. Step 5: Solve for x
    x = 338,556,553,890.47/621,087.52
  6. Step 6: Final answer
    x = 545,102.81

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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.