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Finding the Fourth Proportional to 382.85, 574.28 and 139.35

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Solution

The fourth proportional to 382.85, 574.28 and 139.35 is: 209.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.85 : 574.28 = 139.35 : x
  2. Step 2: Convert to fraction form
    382.85/574.28 = 139.35/x
  3. Step 3: Cross multiply
    382.85x = 574.28 × 139.35
  4. Step 4: Simplify right side
    382.85x = 80,025.22
  5. Step 5: Solve for x
    x = 80,025.22/382.85
  6. Step 6: Final answer
    x = 209.03

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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.