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Finding the Fourth Proportional to 638,139.40, 957,209.10 and 354,704.20

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Solution

The fourth proportional to 638,139.40, 957,209.10 and 354,704.20 is: 532,056.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,139.40 : 957,209.10 = 354,704.20 : x
  2. Step 2: Convert to fraction form
    638,139.40/957,209.10 = 354,704.20/x
  3. Step 3: Cross multiply
    638,139.40x = 957,209.10 × 354,704.20
  4. Step 4: Simplify right side
    638,139.40x = 339,526,088,048.22
  5. Step 5: Solve for x
    x = 339,526,088,048.22/638,139.40
  6. Step 6: Final answer
    x = 532,056.30

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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.