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Finding the Fourth Proportional to 706.50, 1,059.21 and 381.42

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Solution

The fourth proportional to 706.50, 1,059.21 and 381.42 is: 571.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    706.50 : 1,059.21 = 381.42 : x
  2. Step 2: Convert to fraction form
    706.50/1,059.21 = 381.42/x
  3. Step 3: Cross multiply
    706.50x = 1,059.21 × 381.42
  4. Step 4: Simplify right side
    706.50x = 404,003.88
  5. Step 5: Solve for x
    x = 404,003.88/706.50
  6. Step 6: Final answer
    x = 571.84

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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.