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Finding the Fourth Proportional to 394,411.60, 591,703.80 and 128,126.80

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Solution

The fourth proportional to 394,411.60, 591,703.80 and 128,126.80 is: 192,218.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,411.60 : 591,703.80 = 128,126.80 : x
  2. Step 2: Convert to fraction form
    394,411.60/591,703.80 = 128,126.80/x
  3. Step 3: Cross multiply
    394,411.60x = 591,703.80 × 128,126.80
  4. Step 4: Simplify right side
    394,411.60x = 75,813,114,441.84
  5. Step 5: Solve for x
    x = 75,813,114,441.84/394,411.60
  6. Step 6: Final answer
    x = 192,218.27

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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.