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Finding the Fourth Proportional to 382.99, 574.40 and 139.43

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Solution

The fourth proportional to 382.99, 574.40 and 139.43 is: 209.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.99 : 574.40 = 139.43 : x
  2. Step 2: Convert to fraction form
    382.99/574.40 = 139.43/x
  3. Step 3: Cross multiply
    382.99x = 574.40 × 139.43
  4. Step 4: Simplify right side
    382.99x = 80,090.38
  5. Step 5: Solve for x
    x = 80,090.38/382.99
  6. Step 6: Final answer
    x = 209.12

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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.