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Finding the Fourth Proportional to 438.38, 657.12 and 221.48

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Solution

The fourth proportional to 438.38, 657.12 and 221.48 is: 331.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.38 : 657.12 = 221.48 : x
  2. Step 2: Convert to fraction form
    438.38/657.12 = 221.48/x
  3. Step 3: Cross multiply
    438.38x = 657.12 × 221.48
  4. Step 4: Simplify right side
    438.38x = 145,538.94
  5. Step 5: Solve for x
    x = 145,538.94/438.38
  6. Step 6: Final answer
    x = 331.99

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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.