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Finding the Fourth Proportional to 221.16, 305.46 and 188.76

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Solution

The fourth proportional to 221.16, 305.46 and 188.76 is: 260.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.16 : 305.46 = 188.76 : x
  2. Step 2: Convert to fraction form
    221.16/305.46 = 188.76/x
  3. Step 3: Cross multiply
    221.16x = 305.46 × 188.76
  4. Step 4: Simplify right side
    221.16x = 57,658.63
  5. Step 5: Solve for x
    x = 57,658.63/221.16
  6. Step 6: Final answer
    x = 260.71

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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.