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Finding the Fourth Proportional to 638,039.70, 957,189.15 and 217,358.10

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Solution

The fourth proportional to 638,039.70, 957,189.15 and 217,358.10 is: 326,081.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,039.70 : 957,189.15 = 217,358.10 : x
  2. Step 2: Convert to fraction form
    638,039.70/957,189.15 = 217,358.10/x
  3. Step 3: Cross multiply
    638,039.70x = 957,189.15 × 217,358.10
  4. Step 4: Simplify right side
    638,039.70x = 208,052,814,984.62
  5. Step 5: Solve for x
    x = 208,052,814,984.62/638,039.70
  6. Step 6: Final answer
    x = 326,081.30

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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.