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Finding the Fourth Proportional to 638,171.40, 957,257.10 and 217,345.80

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Solution

The fourth proportional to 638,171.40, 957,257.10 and 217,345.80 is: 326,018.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,171.40 : 957,257.10 = 217,345.80 : x
  2. Step 2: Convert to fraction form
    638,171.40/957,257.10 = 217,345.80/x
  3. Step 3: Cross multiply
    638,171.40x = 957,257.10 × 217,345.80
  4. Step 4: Simplify right side
    638,171.40x = 208,055,810,205.18
  5. Step 5: Solve for x
    x = 208,055,810,205.18/638,171.40
  6. Step 6: Final answer
    x = 326,018.70

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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.