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Finding the Fourth Proportional to 442.71, 663.75 and 211.64

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Solution

The fourth proportional to 442.71, 663.75 and 211.64 is: 317.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.71 : 663.75 = 211.64 : x
  2. Step 2: Convert to fraction form
    442.71/663.75 = 211.64/x
  3. Step 3: Cross multiply
    442.71x = 663.75 × 211.64
  4. Step 4: Simplify right side
    442.71x = 140,472.73
  5. Step 5: Solve for x
    x = 140,472.73/442.71
  6. Step 6: Final answer
    x = 317.30

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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.