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Finding the Fourth Proportional to 352.20, 485.45 and 322.78

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Solution

The fourth proportional to 352.20, 485.45 and 322.78 is: 444.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.20 : 485.45 = 322.78 : x
  2. Step 2: Convert to fraction form
    352.20/485.45 = 322.78/x
  3. Step 3: Cross multiply
    352.20x = 485.45 × 322.78
  4. Step 4: Simplify right side
    352.20x = 156,691.94
  5. Step 5: Solve for x
    x = 156,691.94/352.20
  6. Step 6: Final answer
    x = 444.90

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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.