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Finding the Fourth Proportional to 381.40, 572.16 and 236.92

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Solution

The fourth proportional to 381.40, 572.16 and 236.92 is: 355.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.40 : 572.16 = 236.92 : x
  2. Step 2: Convert to fraction form
    381.40/572.16 = 236.92/x
  3. Step 3: Cross multiply
    381.40x = 572.16 × 236.92
  4. Step 4: Simplify right side
    381.40x = 135,556.15
  5. Step 5: Solve for x
    x = 135,556.15/381.40
  6. Step 6: Final answer
    x = 355.42

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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.