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Finding the Fourth Proportional to 383.49, 574.74 and 139.73

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Solution

The fourth proportional to 383.49, 574.74 and 139.73 is: 209.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.49 : 574.74 = 139.73 : x
  2. Step 2: Convert to fraction form
    383.49/574.74 = 139.73/x
  3. Step 3: Cross multiply
    383.49x = 574.74 × 139.73
  4. Step 4: Simplify right side
    383.49x = 80,305.55
  5. Step 5: Solve for x
    x = 80,305.55/383.49
  6. Step 6: Final answer
    x = 209.41

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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.