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Finding the Fourth Proportional to 112.54, 168.74 and 54.77

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Solution

The fourth proportional to 112.54, 168.74 and 54.77 is: 82.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.54 : 168.74 = 54.77 : x
  2. Step 2: Convert to fraction form
    112.54/168.74 = 54.77/x
  3. Step 3: Cross multiply
    112.54x = 168.74 × 54.77
  4. Step 4: Simplify right side
    112.54x = 9,241.05
  5. Step 5: Solve for x
    x = 9,241.05/112.54
  6. Step 6: Final answer
    x = 82.12

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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.