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Finding the Fourth Proportional to 382.78, 528.30 and 225.42

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Solution

The fourth proportional to 382.78, 528.30 and 225.42 is: 311.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.78 : 528.30 = 225.42 : x
  2. Step 2: Convert to fraction form
    382.78/528.30 = 225.42/x
  3. Step 3: Cross multiply
    382.78x = 528.30 × 225.42
  4. Step 4: Simplify right side
    382.78x = 119,089.39
  5. Step 5: Solve for x
    x = 119,089.39/382.78
  6. Step 6: Final answer
    x = 311.12

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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.