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Finding the Fourth Proportional to 381.34, 571.98 and 107.42

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Solution

The fourth proportional to 381.34, 571.98 and 107.42 is: 161.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.34 : 571.98 = 107.42 : x
  2. Step 2: Convert to fraction form
    381.34/571.98 = 107.42/x
  3. Step 3: Cross multiply
    381.34x = 571.98 × 107.42
  4. Step 4: Simplify right side
    381.34x = 61,439.23
  5. Step 5: Solve for x
    x = 61,439.23/381.34
  6. Step 6: Final answer
    x = 161.12

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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.