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Finding the Fourth Proportional to 638,196.90, 956,420.55 and 520,098.90

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Solution

The fourth proportional to 638,196.90, 956,420.55 and 520,098.90 is: 779,435.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,196.90 : 956,420.55 = 520,098.90 : x
  2. Step 2: Convert to fraction form
    638,196.90/956,420.55 = 520,098.90/x
  3. Step 3: Cross multiply
    638,196.90x = 956,420.55 × 520,098.90
  4. Step 4: Simplify right side
    638,196.90x = 497,433,275,992.40
  5. Step 5: Solve for x
    x = 497,433,275,992.40/638,196.90
  6. Step 6: Final answer
    x = 779,435.43

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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.