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Finding the Fourth Proportional to 352.31, 486.23 and 221.30

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Solution

The fourth proportional to 352.31, 486.23 and 221.30 is: 305.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.31 : 486.23 = 221.30 : x
  2. Step 2: Convert to fraction form
    352.31/486.23 = 221.30/x
  3. Step 3: Cross multiply
    352.31x = 486.23 × 221.30
  4. Step 4: Simplify right side
    352.31x = 107,602.70
  5. Step 5: Solve for x
    x = 107,602.70/352.31
  6. Step 6: Final answer
    x = 305.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.