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Finding the Fourth Proportional to 351.95, 485.60 and 221.13

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Solution

The fourth proportional to 351.95, 485.60 and 221.13 is: 305.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.95 : 485.60 = 221.13 : x
  2. Step 2: Convert to fraction form
    351.95/485.60 = 221.13/x
  3. Step 3: Cross multiply
    351.95x = 485.60 × 221.13
  4. Step 4: Simplify right side
    351.95x = 107,379.62
  5. Step 5: Solve for x
    x = 107,379.62/351.95
  6. Step 6: Final answer
    x = 305.10

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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.