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Finding the Fourth Proportional to 351.79, 485.48 and 220.72

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Solution

The fourth proportional to 351.79, 485.48 and 220.72 is: 304.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.79 : 485.48 = 220.72 : x
  2. Step 2: Convert to fraction form
    351.79/485.48 = 220.72/x
  3. Step 3: Cross multiply
    351.79x = 485.48 × 220.72
  4. Step 4: Simplify right side
    351.79x = 107,154.04
  5. Step 5: Solve for x
    x = 107,154.04/351.79
  6. Step 6: Final answer
    x = 304.60

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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.