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Finding the Fourth Proportional to 351.56, 485.04 and 211.73

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Solution

The fourth proportional to 351.56, 485.04 and 211.73 is: 292.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.56 : 485.04 = 211.73 : x
  2. Step 2: Convert to fraction form
    351.56/485.04 = 211.73/x
  3. Step 3: Cross multiply
    351.56x = 485.04 × 211.73
  4. Step 4: Simplify right side
    351.56x = 102,695.89
  5. Step 5: Solve for x
    x = 102,695.89/351.56
  6. Step 6: Final answer
    x = 292.11

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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.