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Finding the Fourth Proportional to 394,813.55, 592,261.81 and 128,594.80

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Solution

The fourth proportional to 394,813.55, 592,261.81 and 128,594.80 is: 192,905.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,813.55 : 592,261.81 = 128,594.80 : x
  2. Step 2: Convert to fraction form
    394,813.55/592,261.81 = 128,594.80/x
  3. Step 3: Cross multiply
    394,813.55x = 592,261.81 × 128,594.80
  4. Step 4: Simplify right side
    394,813.55x = 76,161,789,004.59
  5. Step 5: Solve for x
    x = 76,161,789,004.59/394,813.55
  6. Step 6: Final answer
    x = 192,905.71

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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.