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Finding the Fourth Proportional to 263,003.80, 394,505.70 and 221,013.40

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Solution

The fourth proportional to 263,003.80, 394,505.70 and 221,013.40 is: 331,520.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    263,003.80 : 394,505.70 = 221,013.40 : x
  2. Step 2: Convert to fraction form
    263,003.80/394,505.70 = 221,013.40/x
  3. Step 3: Cross multiply
    263,003.80x = 394,505.70 × 221,013.40
  4. Step 4: Simplify right side
    263,003.80x = 87,191,046,076.38
  5. Step 5: Solve for x
    x = 87,191,046,076.38/263,003.80
  6. Step 6: Final answer
    x = 331,520.10

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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.