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Finding the Fourth Proportional to 383.42, 575.11 and 139.95

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Solution

The fourth proportional to 383.42, 575.11 and 139.95 is: 209.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.42 : 575.11 = 139.95 : x
  2. Step 2: Convert to fraction form
    383.42/575.11 = 139.95/x
  3. Step 3: Cross multiply
    383.42x = 575.11 × 139.95
  4. Step 4: Simplify right side
    383.42x = 80,486.64
  5. Step 5: Solve for x
    x = 80,486.64/383.42
  6. Step 6: Final answer
    x = 209.92

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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.