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Finding the Fourth Proportional to 438.11, 657.17 and 221.57

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Solution

The fourth proportional to 438.11, 657.17 and 221.57 is: 332.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.11 : 657.17 = 221.57 : x
  2. Step 2: Convert to fraction form
    438.11/657.17 = 221.57/x
  3. Step 3: Cross multiply
    438.11x = 657.17 × 221.57
  4. Step 4: Simplify right side
    438.11x = 145,606.42
  5. Step 5: Solve for x
    x = 145,606.42/438.11
  6. Step 6: Final answer
    x = 332.36

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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.