Home / 617,936.20-926,904.30-428,979.40

Finding the Fourth Proportional to 617,936.20, 926,904.30 and 428,979.40

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Solution

The fourth proportional to 617,936.20, 926,904.30 and 428,979.40 is: 643,469.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    617,936.20 : 926,904.30 = 428,979.40 : x
  2. Step 2: Convert to fraction form
    617,936.20/926,904.30 = 428,979.40/x
  3. Step 3: Cross multiply
    617,936.20x = 926,904.30 × 428,979.40
  4. Step 4: Simplify right side
    617,936.20x = 397,622,850,471.42
  5. Step 5: Solve for x
    x = 397,622,850,471.42/617,936.20
  6. Step 6: Final answer
    x = 643,469.10

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Half scale
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Double scale
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Similar ratio
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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.