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Finding the Fourth Proportional to 221.62, 305.89 and 188.90

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Solution

The fourth proportional to 221.62, 305.89 and 188.90 is: 260.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.62 : 305.89 = 188.90 : x
  2. Step 2: Convert to fraction form
    221.62/305.89 = 188.90/x
  3. Step 3: Cross multiply
    221.62x = 305.89 × 188.90
  4. Step 4: Simplify right side
    221.62x = 57,782.62
  5. Step 5: Solve for x
    x = 57,782.62/221.62
  6. Step 6: Final answer
    x = 260.73

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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.