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Finding the Fourth Proportional to 263,404.80, 393,940.80 and 221,414.40

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Solution

The fourth proportional to 263,404.80, 393,940.80 and 221,414.40 is: 331,141.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    263,404.80 : 393,940.80 = 221,414.40 : x
  2. Step 2: Convert to fraction form
    263,404.80/393,940.80 = 221,414.40/x
  3. Step 3: Cross multiply
    263,404.80x = 393,940.80 × 221,414.40
  4. Step 4: Simplify right side
    263,404.80x = 87,224,165,867.52
  5. Step 5: Solve for x
    x = 87,224,165,867.52/263,404.80
  6. Step 6: Final answer
    x = 331,141.14

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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.