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Finding the Fourth Proportional to 437.31, 656.57 and 221.04

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Solution

The fourth proportional to 437.31, 656.57 and 221.04 is: 331.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    437.31 : 656.57 = 221.04 : x
  2. Step 2: Convert to fraction form
    437.31/656.57 = 221.04/x
  3. Step 3: Cross multiply
    437.31x = 656.57 × 221.04
  4. Step 4: Simplify right side
    437.31x = 145,128.79
  5. Step 5: Solve for x
    x = 145,128.79/437.31
  6. Step 6: Final answer
    x = 331.87

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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.