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Finding the Fourth Proportional to 718,404.67, 991,396.66 and 396,119.85

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Solution

The fourth proportional to 718,404.67, 991,396.66 and 396,119.85 is: 546,644.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,404.67 : 991,396.66 = 396,119.85 : x
  2. Step 2: Convert to fraction form
    718,404.67/991,396.66 = 396,119.85/x
  3. Step 3: Cross multiply
    718,404.67x = 991,396.66 × 396,119.85
  4. Step 4: Simplify right side
    718,404.67x = 392,711,896,249.70
  5. Step 5: Solve for x
    x = 392,711,896,249.70/718,404.67
  6. Step 6: Final answer
    x = 546,644.41

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Double scale
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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.