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Finding the Fourth Proportional to 641,431.32, 885,115.10 and 383,256.88

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Solution

The fourth proportional to 641,431.32, 885,115.10 and 383,256.88 is: 528,858.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,431.32 : 885,115.10 = 383,256.88 : x
  2. Step 2: Convert to fraction form
    641,431.32/885,115.10 = 383,256.88/x
  3. Step 3: Cross multiply
    641,431.32x = 885,115.10 × 383,256.88
  4. Step 4: Simplify right side
    641,431.32x = 339,226,451,666.89
  5. Step 5: Solve for x
    x = 339,226,451,666.89/641,431.32
  6. Step 6: Final answer
    x = 528,858.57

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.