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Finding the Fourth Proportional to 438.22, 657.42 and 221.77

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Solution

The fourth proportional to 438.22, 657.42 and 221.77 is: 332.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.22 : 657.42 = 221.77 : x
  2. Step 2: Convert to fraction form
    438.22/657.42 = 221.77/x
  3. Step 3: Cross multiply
    438.22x = 657.42 × 221.77
  4. Step 4: Simplify right side
    438.22x = 145,796.03
  5. Step 5: Solve for x
    x = 145,796.03/438.22
  6. Step 6: Final answer
    x = 332.70

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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.