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Finding the Fourth Proportional to 394,491.20, 591,736.80 and 128,260.40

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Solution

The fourth proportional to 394,491.20, 591,736.80 and 128,260.40 is: 192,390.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,491.20 : 591,736.80 = 128,260.40 : x
  2. Step 2: Convert to fraction form
    394,491.20/591,736.80 = 128,260.40/x
  3. Step 3: Cross multiply
    394,491.20x = 591,736.80 × 128,260.40
  4. Step 4: Simplify right side
    394,491.20x = 75,896,398,662.72
  5. Step 5: Solve for x
    x = 75,896,398,662.72/394,491.20
  6. Step 6: Final answer
    x = 192,390.60

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1.5x scale

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.