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Finding the Fourth Proportional to 442.53, 663.32 and 211.31

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Solution

The fourth proportional to 442.53, 663.32 and 211.31 is: 316.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.53 : 663.32 = 211.31 : x
  2. Step 2: Convert to fraction form
    442.53/663.32 = 211.31/x
  3. Step 3: Cross multiply
    442.53x = 663.32 × 211.31
  4. Step 4: Simplify right side
    442.53x = 140,166.15
  5. Step 5: Solve for x
    x = 140,166.15/442.53
  6. Step 6: Final answer
    x = 316.74

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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.