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Finding the Fourth Proportional to 381.90, 570.06 and 349.44

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Solution

The fourth proportional to 381.90, 570.06 and 349.44 is: 521.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.90 : 570.06 = 349.44 : x
  2. Step 2: Convert to fraction form
    381.90/570.06 = 349.44/x
  3. Step 3: Cross multiply
    381.90x = 570.06 × 349.44
  4. Step 4: Simplify right side
    381.90x = 199,201.77
  5. Step 5: Solve for x
    x = 199,201.77/381.90
  6. Step 6: Final answer
    x = 521.61

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.