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Finding the Fourth Proportional to 442.48, 663.29 and 211.31

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Solution

The fourth proportional to 442.48, 663.29 and 211.31 is: 316.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.48 : 663.29 = 211.31 : x
  2. Step 2: Convert to fraction form
    442.48/663.29 = 211.31/x
  3. Step 3: Cross multiply
    442.48x = 663.29 × 211.31
  4. Step 4: Simplify right side
    442.48x = 140,159.81
  5. Step 5: Solve for x
    x = 140,159.81/442.48
  6. Step 6: Final answer
    x = 316.76

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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.