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Finding the Fourth Proportional to 638,446.60, 957,605.10 and 217,716.40

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Solution

The fourth proportional to 638,446.60, 957,605.10 and 217,716.40 is: 326,552.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,446.60 : 957,605.10 = 217,716.40 : x
  2. Step 2: Convert to fraction form
    638,446.60/957,605.10 = 217,716.40/x
  3. Step 3: Cross multiply
    638,446.60x = 957,605.10 × 217,716.40
  4. Step 4: Simplify right side
    638,446.60x = 208,486,334,993.64
  5. Step 5: Solve for x
    x = 208,486,334,993.64/638,446.60
  6. Step 6: Final answer
    x = 326,552.50

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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.