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Finding the Fourth Proportional to 382.97, 574.75 and 139.56

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Solution

The fourth proportional to 382.97, 574.75 and 139.56 is: 209.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.97 : 574.75 = 139.56 : x
  2. Step 2: Convert to fraction form
    382.97/574.75 = 139.56/x
  3. Step 3: Cross multiply
    382.97x = 574.75 × 139.56
  4. Step 4: Simplify right side
    382.97x = 80,212.11
  5. Step 5: Solve for x
    x = 80,212.11/382.97
  6. Step 6: Final answer
    x = 209.45

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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.