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Finding the Fourth Proportional to 665.33, 997.94 and 421.31

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Solution

The fourth proportional to 665.33, 997.94 and 421.31 is: 631.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.33 : 997.94 = 421.31 : x
  2. Step 2: Convert to fraction form
    665.33/997.94 = 421.31/x
  3. Step 3: Cross multiply
    665.33x = 997.94 × 421.31
  4. Step 4: Simplify right side
    665.33x = 420,442.49
  5. Step 5: Solve for x
    x = 420,442.49/665.33
  6. Step 6: Final answer
    x = 631.94

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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.