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Finding the Fourth Proportional to 419,489.83, 578,879.60 and 256,419.35

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Solution

The fourth proportional to 419,489.83, 578,879.60 and 256,419.35 is: 353,848.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    419,489.83 : 578,879.60 = 256,419.35 : x
  2. Step 2: Convert to fraction form
    419,489.83/578,879.60 = 256,419.35/x
  3. Step 3: Cross multiply
    419,489.83x = 578,879.60 × 256,419.35
  4. Step 4: Simplify right side
    419,489.83x = 148,435,926,583.77
  5. Step 5: Solve for x
    x = 148,435,926,583.77/419,489.83
  6. Step 6: Final answer
    x = 353,848.69

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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.