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Finding the Fourth Proportional to 382.60, 528 and 225.20

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Solution

The fourth proportional to 382.60, 528 and 225.20 is: 310.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.60 : 528 = 225.20 : x
  2. Step 2: Convert to fraction form
    382.60/528 = 225.20/x
  3. Step 3: Cross multiply
    382.60x = 528 × 225.20
  4. Step 4: Simplify right side
    382.60x = 118,905.60
  5. Step 5: Solve for x
    x = 118,905.60/382.60
  6. Step 6: Final answer
    x = 310.78

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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.