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Finding the Fourth Proportional to 438.57, 657.82 and 221.98

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Solution

The fourth proportional to 438.57, 657.82 and 221.98 is: 332.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.57 : 657.82 = 221.98 : x
  2. Step 2: Convert to fraction form
    438.57/657.82 = 221.98/x
  3. Step 3: Cross multiply
    438.57x = 657.82 × 221.98
  4. Step 4: Simplify right side
    438.57x = 146,022.88
  5. Step 5: Solve for x
    x = 146,022.88/438.57
  6. Step 6: Final answer
    x = 332.95

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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.