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Finding the Fourth Proportional to 383.11, 528.69 and 217.32

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Solution

The fourth proportional to 383.11, 528.69 and 217.32 is: 299.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.11 : 528.69 = 217.32 : x
  2. Step 2: Convert to fraction form
    383.11/528.69 = 217.32/x
  3. Step 3: Cross multiply
    383.11x = 528.69 × 217.32
  4. Step 4: Simplify right side
    383.11x = 114,893.74
  5. Step 5: Solve for x
    x = 114,893.74/383.11
  6. Step 6: Final answer
    x = 299.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.