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Finding the Fourth Proportional to 185.12, 277.56 and 76.88

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Solution

The fourth proportional to 185.12, 277.56 and 76.88 is: 115.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.12 : 277.56 = 76.88 : x
  2. Step 2: Convert to fraction form
    185.12/277.56 = 76.88/x
  3. Step 3: Cross multiply
    185.12x = 277.56 × 76.88
  4. Step 4: Simplify right side
    185.12x = 21,338.81
  5. Step 5: Solve for x
    x = 21,338.81/185.12
  6. Step 6: Final answer
    x = 115.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.