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Finding the Fourth Proportional to 438.52, 656.82 and 221.64

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Solution

The fourth proportional to 438.52, 656.82 and 221.64 is: 331.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.52 : 656.82 = 221.64 : x
  2. Step 2: Convert to fraction form
    438.52/656.82 = 221.64/x
  3. Step 3: Cross multiply
    438.52x = 656.82 × 221.64
  4. Step 4: Simplify right side
    438.52x = 145,577.58
  5. Step 5: Solve for x
    x = 145,577.58/438.52
  6. Step 6: Final answer
    x = 331.97

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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.