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Finding the Fourth Proportional to 618,905.74, 854,369.78 and 389,799.74

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Solution

The fourth proportional to 618,905.74, 854,369.78 and 389,799.74 is: 538,099.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    618,905.74 : 854,369.78 = 389,799.74 : x
  2. Step 2: Convert to fraction form
    618,905.74/854,369.78 = 389,799.74/x
  3. Step 3: Cross multiply
    618,905.74x = 854,369.78 × 389,799.74
  4. Step 4: Simplify right side
    618,905.74x = 333,033,118,107.86
  5. Step 5: Solve for x
    x = 333,033,118,107.86/618,905.74
  6. Step 6: Final answer
    x = 538,099.90

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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.