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Finding the Fourth Proportional to 221.46, 333.40 and 191.69

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Solution

The fourth proportional to 221.46, 333.40 and 191.69 is: 288.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.46 : 333.40 = 191.69 : x
  2. Step 2: Convert to fraction form
    221.46/333.40 = 191.69/x
  3. Step 3: Cross multiply
    221.46x = 333.40 × 191.69
  4. Step 4: Simplify right side
    221.46x = 63,909.45
  5. Step 5: Solve for x
    x = 63,909.45/221.46
  6. Step 6: Final answer
    x = 288.58

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.