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Finding the Fourth Proportional to 76.36, 105.36 and 55.78

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Solution

The fourth proportional to 76.36, 105.36 and 55.78 is: 76.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.36 : 105.36 = 55.78 : x
  2. Step 2: Convert to fraction form
    76.36/105.36 = 55.78/x
  3. Step 3: Cross multiply
    76.36x = 105.36 × 55.78
  4. Step 4: Simplify right side
    76.36x = 5,876.98
  5. Step 5: Solve for x
    x = 5,876.98/76.36
  6. Step 6: Final answer
    x = 76.96

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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.