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Finding the Fourth Proportional to 383.31, 575.05 and 139.83

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Solution

The fourth proportional to 383.31, 575.05 and 139.83 is: 209.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.31 : 575.05 = 139.83 : x
  2. Step 2: Convert to fraction form
    383.31/575.05 = 139.83/x
  3. Step 3: Cross multiply
    383.31x = 575.05 × 139.83
  4. Step 4: Simplify right side
    383.31x = 80,410.15
  5. Step 5: Solve for x
    x = 80,410.15/383.31
  6. Step 6: Final answer
    x = 209.78

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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.