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Finding the Fourth Proportional to 262,890.70, 394,336.05 and 221,418.70

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Solution

The fourth proportional to 262,890.70, 394,336.05 and 221,418.70 is: 332,128.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    262,890.70 : 394,336.05 = 221,418.70 : x
  2. Step 2: Convert to fraction form
    262,890.70/394,336.05 = 221,418.70/x
  3. Step 3: Cross multiply
    262,890.70x = 394,336.05 × 221,418.70
  4. Step 4: Simplify right side
    262,890.70x = 87,313,375,554.14
  5. Step 5: Solve for x
    x = 87,313,375,554.14/262,890.70
  6. Step 6: Final answer
    x = 332,128.05

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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.