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Finding the Fourth Proportional to 677,928.27, 935,979.27 and 420,078.84

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Solution

The fourth proportional to 677,928.27, 935,979.27 and 420,078.84 is: 579,980.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    677,928.27 : 935,979.27 = 420,078.84 : x
  2. Step 2: Convert to fraction form
    677,928.27/935,979.27 = 420,078.84/x
  3. Step 3: Cross multiply
    677,928.27x = 935,979.27 × 420,078.84
  4. Step 4: Simplify right side
    677,928.27x = 393,185,086,005.65
  5. Step 5: Solve for x
    x = 393,185,086,005.65/677,928.27
  6. Step 6: Final answer
    x = 579,980.37

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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.