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Finding the Fourth Proportional to 351.92, 485.69 and 212.06

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Solution

The fourth proportional to 351.92, 485.69 and 212.06 is: 292.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.92 : 485.69 = 212.06 : x
  2. Step 2: Convert to fraction form
    351.92/485.69 = 212.06/x
  3. Step 3: Cross multiply
    351.92x = 485.69 × 212.06
  4. Step 4: Simplify right side
    351.92x = 102,991.93
  5. Step 5: Solve for x
    x = 102,991.93/351.92
  6. Step 6: Final answer
    x = 292.66

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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.