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Finding the Fourth Proportional to 394,625.71, 591,945.86 and 128,385.19

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Solution

The fourth proportional to 394,625.71, 591,945.86 and 128,385.19 is: 192,580.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,625.71 : 591,945.86 = 128,385.19 : x
  2. Step 2: Convert to fraction form
    394,625.71/591,945.86 = 128,385.19/x
  3. Step 3: Cross multiply
    394,625.71x = 591,945.86 × 128,385.19
  4. Step 4: Simplify right side
    394,625.71x = 75,997,081,705.81
  5. Step 5: Solve for x
    x = 75,997,081,705.81/394,625.71
  6. Step 6: Final answer
    x = 192,580.16

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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.