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Finding the Fourth Proportional to 74.36, 111.42 and 33.18

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Solution

The fourth proportional to 74.36, 111.42 and 33.18 is: 49.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.36 : 111.42 = 33.18 : x
  2. Step 2: Convert to fraction form
    74.36/111.42 = 33.18/x
  3. Step 3: Cross multiply
    74.36x = 111.42 × 33.18
  4. Step 4: Simplify right side
    74.36x = 3,696.92
  5. Step 5: Solve for x
    x = 3,696.92/74.36
  6. Step 6: Final answer
    x = 49.72

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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.