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Finding the Fourth Proportional to 81.74, 122.59 and 33.64

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Solution

The fourth proportional to 81.74, 122.59 and 33.64 is: 50.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.74 : 122.59 = 33.64 : x
  2. Step 2: Convert to fraction form
    81.74/122.59 = 33.64/x
  3. Step 3: Cross multiply
    81.74x = 122.59 × 33.64
  4. Step 4: Simplify right side
    81.74x = 4,123.93
  5. Step 5: Solve for x
    x = 4,123.93/81.74
  6. Step 6: Final answer
    x = 50.45

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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.