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Finding the Fourth Proportional to 382.79, 528.20 and 216.99

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Solution

The fourth proportional to 382.79, 528.20 and 216.99 is: 299.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.79 : 528.20 = 216.99 : x
  2. Step 2: Convert to fraction form
    382.79/528.20 = 216.99/x
  3. Step 3: Cross multiply
    382.79x = 528.20 × 216.99
  4. Step 4: Simplify right side
    382.79x = 114,614.12
  5. Step 5: Solve for x
    x = 114,614.12/382.79
  6. Step 6: Final answer
    x = 299.42

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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.