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Finding the Fourth Proportional to 351.72, 485.55 and 220.86

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Solution

The fourth proportional to 351.72, 485.55 and 220.86 is: 304.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.72 : 485.55 = 220.86 : x
  2. Step 2: Convert to fraction form
    351.72/485.55 = 220.86/x
  3. Step 3: Cross multiply
    351.72x = 485.55 × 220.86
  4. Step 4: Simplify right side
    351.72x = 107,238.57
  5. Step 5: Solve for x
    x = 107,238.57/351.72
  6. Step 6: Final answer
    x = 304.90

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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.