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Finding the Fourth Proportional to 352.98, 486.88 and 221.76

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Solution

The fourth proportional to 352.98, 486.88 and 221.76 is: 305.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.98 : 486.88 = 221.76 : x
  2. Step 2: Convert to fraction form
    352.98/486.88 = 221.76/x
  3. Step 3: Cross multiply
    352.98x = 486.88 × 221.76
  4. Step 4: Simplify right side
    352.98x = 107,969.95
  5. Step 5: Solve for x
    x = 107,969.95/352.98
  6. Step 6: Final answer
    x = 305.88

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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.