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Finding the Fourth Proportional to 351.77, 485.34 and 211.82

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Solution

The fourth proportional to 351.77, 485.34 and 211.82 is: 292.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.77 : 485.34 = 211.82 : x
  2. Step 2: Convert to fraction form
    351.77/485.34 = 211.82/x
  3. Step 3: Cross multiply
    351.77x = 485.34 × 211.82
  4. Step 4: Simplify right side
    351.77x = 102,804.72
  5. Step 5: Solve for x
    x = 102,804.72/351.77
  6. Step 6: Final answer
    x = 292.25

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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.