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Finding the Fourth Proportional to 552.20, 761.60 and 331.11

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Solution

The fourth proportional to 552.20, 761.60 and 331.11 is: 456.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    552.20 : 761.60 = 331.11 : x
  2. Step 2: Convert to fraction form
    552.20/761.60 = 331.11/x
  3. Step 3: Cross multiply
    552.20x = 761.60 × 331.11
  4. Step 4: Simplify right side
    552.20x = 252,171.72
  5. Step 5: Solve for x
    x = 252,171.72/552.20
  6. Step 6: Final answer
    x = 456.67

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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.