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Finding the Fourth Proportional to 76.44, 105.54 and 55.68

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Solution

The fourth proportional to 76.44, 105.54 and 55.68 is: 76.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.44 : 105.54 = 55.68 : x
  2. Step 2: Convert to fraction form
    76.44/105.54 = 55.68/x
  3. Step 3: Cross multiply
    76.44x = 105.54 × 55.68
  4. Step 4: Simplify right side
    76.44x = 5,876.47
  5. Step 5: Solve for x
    x = 5,876.47/76.44
  6. Step 6: Final answer
    x = 76.88

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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.