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Finding the Fourth Proportional to 578,863.40, 867,128.70 and 389,906.60

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Solution

The fourth proportional to 578,863.40, 867,128.70 and 389,906.60 is: 584,074.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,863.40 : 867,128.70 = 389,906.60 : x
  2. Step 2: Convert to fraction form
    578,863.40/867,128.70 = 389,906.60/x
  3. Step 3: Cross multiply
    578,863.40x = 867,128.70 × 389,906.60
  4. Step 4: Simplify right side
    578,863.40x = 338,099,203,179.42
  5. Step 5: Solve for x
    x = 338,099,203,179.42/578,863.40
  6. Step 6: Final answer
    x = 584,074.24

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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.