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Finding the Fourth Proportional to 382.75, 574.10 and 139.27

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Solution

The fourth proportional to 382.75, 574.10 and 139.27 is: 208.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.75 : 574.10 = 139.27 : x
  2. Step 2: Convert to fraction form
    382.75/574.10 = 139.27/x
  3. Step 3: Cross multiply
    382.75x = 574.10 × 139.27
  4. Step 4: Simplify right side
    382.75x = 79,954.91
  5. Step 5: Solve for x
    x = 79,954.91/382.75
  6. Step 6: Final answer
    x = 208.90

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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.