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Finding the Fourth Proportional to 382.89, 528.36 and 217.11

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Solution

The fourth proportional to 382.89, 528.36 and 217.11 is: 299.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.89 : 528.36 = 217.11 : x
  2. Step 2: Convert to fraction form
    382.89/528.36 = 217.11/x
  3. Step 3: Cross multiply
    382.89x = 528.36 × 217.11
  4. Step 4: Simplify right side
    382.89x = 114,712.24
  5. Step 5: Solve for x
    x = 114,712.24/382.89
  6. Step 6: Final answer
    x = 299.60

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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.