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Finding the Fourth Proportional to 221.76, 331.08 and 191.20

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Solution

The fourth proportional to 221.76, 331.08 and 191.20 is: 285.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.76 : 331.08 = 191.20 : x
  2. Step 2: Convert to fraction form
    221.76/331.08 = 191.20/x
  3. Step 3: Cross multiply
    221.76x = 331.08 × 191.20
  4. Step 4: Simplify right side
    221.76x = 63,302.50
  5. Step 5: Solve for x
    x = 63,302.50/221.76
  6. Step 6: Final answer
    x = 285.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.