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Finding the Fourth Proportional to 220.76, 305.52 and 189.78

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Solution

The fourth proportional to 220.76, 305.52 and 189.78 is: 262.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.76 : 305.52 = 189.78 : x
  2. Step 2: Convert to fraction form
    220.76/305.52 = 189.78/x
  3. Step 3: Cross multiply
    220.76x = 305.52 × 189.78
  4. Step 4: Simplify right side
    220.76x = 57,980.80
  5. Step 5: Solve for x
    x = 57,980.80/220.76
  6. Step 6: Final answer
    x = 262.64

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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.