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Finding the Fourth Proportional to 92.78, 128.03 and 55.96

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Solution

The fourth proportional to 92.78, 128.03 and 55.96 is: 77.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.78 : 128.03 = 55.96 : x
  2. Step 2: Convert to fraction form
    92.78/128.03 = 55.96/x
  3. Step 3: Cross multiply
    92.78x = 128.03 × 55.96
  4. Step 4: Simplify right side
    92.78x = 7,163.96
  5. Step 5: Solve for x
    x = 7,163.96/92.78
  6. Step 6: Final answer
    x = 77.22

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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.