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Finding the Fourth Proportional to 383.45, 574.85 and 139.81

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Solution

The fourth proportional to 383.45, 574.85 and 139.81 is: 209.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.45 : 574.85 = 139.81 : x
  2. Step 2: Convert to fraction form
    383.45/574.85 = 139.81/x
  3. Step 3: Cross multiply
    383.45x = 574.85 × 139.81
  4. Step 4: Simplify right side
    383.45x = 80,369.78
  5. Step 5: Solve for x
    x = 80,369.78/383.45
  6. Step 6: Final answer
    x = 209.60

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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.