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Finding the Fourth Proportional to 81.16, 112 and 54.96

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Solution

The fourth proportional to 81.16, 112 and 54.96 is: 75.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.16 : 112 = 54.96 : x
  2. Step 2: Convert to fraction form
    81.16/112 = 54.96/x
  3. Step 3: Cross multiply
    81.16x = 112 × 54.96
  4. Step 4: Simplify right side
    81.16x = 6,155.52
  5. Step 5: Solve for x
    x = 6,155.52/81.16
  6. Step 6: Final answer
    x = 75.84

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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.