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Finding the Fourth Proportional to 438.48, 657.60 and 221.96

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Solution

The fourth proportional to 438.48, 657.60 and 221.96 is: 332.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.48 : 657.60 = 221.96 : x
  2. Step 2: Convert to fraction form
    438.48/657.60 = 221.96/x
  3. Step 3: Cross multiply
    438.48x = 657.60 × 221.96
  4. Step 4: Simplify right side
    438.48x = 145,960.90
  5. Step 5: Solve for x
    x = 145,960.90/438.48
  6. Step 6: Final answer
    x = 332.88

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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.