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Finding the Fourth Proportional to 351.98, 486.02 and 221.03

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Solution

The fourth proportional to 351.98, 486.02 and 221.03 is: 305.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.98 : 486.02 = 221.03 : x
  2. Step 2: Convert to fraction form
    351.98/486.02 = 221.03/x
  3. Step 3: Cross multiply
    351.98x = 486.02 × 221.03
  4. Step 4: Simplify right side
    351.98x = 107,424.95
  5. Step 5: Solve for x
    x = 107,424.95/351.98
  6. Step 6: Final answer
    x = 305.20

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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.