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Finding the Fourth Proportional to 346.28, 477.72 and 221.96

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Solution

The fourth proportional to 346.28, 477.72 and 221.96 is: 306.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.28 : 477.72 = 221.96 : x
  2. Step 2: Convert to fraction form
    346.28/477.72 = 221.96/x
  3. Step 3: Cross multiply
    346.28x = 477.72 × 221.96
  4. Step 4: Simplify right side
    346.28x = 106,034.73
  5. Step 5: Solve for x
    x = 106,034.73/346.28
  6. Step 6: Final answer
    x = 306.21

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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.