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Finding the Fourth Proportional to 382.98, 528.48 and 217.18

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Solution

The fourth proportional to 382.98, 528.48 and 217.18 is: 299.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.98 : 528.48 = 217.18 : x
  2. Step 2: Convert to fraction form
    382.98/528.48 = 217.18/x
  3. Step 3: Cross multiply
    382.98x = 528.48 × 217.18
  4. Step 4: Simplify right side
    382.98x = 114,773.97
  5. Step 5: Solve for x
    x = 114,773.97/382.98
  6. Step 6: Final answer
    x = 299.69

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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.