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Finding the Fourth Proportional to 394,446.38, 591,374.32 and 128,047.91

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Solution

The fourth proportional to 394,446.38, 591,374.32 and 128,047.91 is: 191,976.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,446.38 : 591,374.32 = 128,047.91 : x
  2. Step 2: Convert to fraction form
    394,446.38/591,374.32 = 128,047.91/x
  3. Step 3: Cross multiply
    394,446.38x = 591,374.32 × 128,047.91
  4. Step 4: Simplify right side
    394,446.38x = 75,724,242,426.68
  5. Step 5: Solve for x
    x = 75,724,242,426.68/394,446.38
  6. Step 6: Final answer
    x = 191,976.01

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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.