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Finding the Fourth Proportional to 383.55, 574.81 and 139.85

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Solution

The fourth proportional to 383.55, 574.81 and 139.85 is: 209.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.55 : 574.81 = 139.85 : x
  2. Step 2: Convert to fraction form
    383.55/574.81 = 139.85/x
  3. Step 3: Cross multiply
    383.55x = 574.81 × 139.85
  4. Step 4: Simplify right side
    383.55x = 80,384.30
  5. Step 5: Solve for x
    x = 80,384.30/383.55
  6. Step 6: Final answer
    x = 209.58

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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.