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Finding the Fourth Proportional to 351.60, 485.20 and 220.64

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Solution

The fourth proportional to 351.60, 485.20 and 220.64 is: 304.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.60 : 485.20 = 220.64 : x
  2. Step 2: Convert to fraction form
    351.60/485.20 = 220.64/x
  3. Step 3: Cross multiply
    351.60x = 485.20 × 220.64
  4. Step 4: Simplify right side
    351.60x = 107,054.53
  5. Step 5: Solve for x
    x = 107,054.53/351.60
  6. Step 6: Final answer
    x = 304.48

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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.