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Finding the Fourth Proportional to 74.91, 112.20 and 54.54

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Solution

The fourth proportional to 74.91, 112.20 and 54.54 is: 81.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.91 : 112.20 = 54.54 : x
  2. Step 2: Convert to fraction form
    74.91/112.20 = 54.54/x
  3. Step 3: Cross multiply
    74.91x = 112.20 × 54.54
  4. Step 4: Simplify right side
    74.91x = 6,119.39
  5. Step 5: Solve for x
    x = 6,119.39/74.91
  6. Step 6: Final answer
    x = 81.69

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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.