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Finding the Fourth Proportional to 410,187.20, 615,280.80 and 394,440.80

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Solution

The fourth proportional to 410,187.20, 615,280.80 and 394,440.80 is: 591,661.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    410,187.20 : 615,280.80 = 394,440.80 : x
  2. Step 2: Convert to fraction form
    410,187.20/615,280.80 = 394,440.80/x
  3. Step 3: Cross multiply
    410,187.20x = 615,280.80 × 394,440.80
  4. Step 4: Simplify right side
    410,187.20x = 242,691,850,976.64
  5. Step 5: Solve for x
    x = 242,691,850,976.64/410,187.20
  6. Step 6: Final answer
    x = 591,661.20

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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.