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Finding the Fourth Proportional to 438.73, 657.59 and 221.85

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Solution

The fourth proportional to 438.73, 657.59 and 221.85 is: 332.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.73 : 657.59 = 221.85 : x
  2. Step 2: Convert to fraction form
    438.73/657.59 = 221.85/x
  3. Step 3: Cross multiply
    438.73x = 657.59 × 221.85
  4. Step 4: Simplify right side
    438.73x = 145,883.05
  5. Step 5: Solve for x
    x = 145,883.05/438.73
  6. Step 6: Final answer
    x = 332.52

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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.