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Finding the Fourth Proportional to 442.82, 663.68 and 211.20

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Solution

The fourth proportional to 442.82, 663.68 and 211.20 is: 316.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.82 : 663.68 = 211.20 : x
  2. Step 2: Convert to fraction form
    442.82/663.68 = 211.20/x
  3. Step 3: Cross multiply
    442.82x = 663.68 × 211.20
  4. Step 4: Simplify right side
    442.82x = 140,168.16
  5. Step 5: Solve for x
    x = 140,168.16/442.82
  6. Step 6: Final answer
    x = 316.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.