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Finding the Fourth Proportional to 654.05, 980.94 and 221.11

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Solution

The fourth proportional to 654.05, 980.94 and 221.11 is: 331.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.05 : 980.94 = 221.11 : x
  2. Step 2: Convert to fraction form
    654.05/980.94 = 221.11/x
  3. Step 3: Cross multiply
    654.05x = 980.94 × 221.11
  4. Step 4: Simplify right side
    654.05x = 216,894.02
  5. Step 5: Solve for x
    x = 216,894.02/654.05
  6. Step 6: Final answer
    x = 331.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.