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Finding the Fourth Proportional to 81.40, 122.16 and 33.34

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Solution

The fourth proportional to 81.40, 122.16 and 33.34 is: 50.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.40 : 122.16 = 33.34 : x
  2. Step 2: Convert to fraction form
    81.40/122.16 = 33.34/x
  3. Step 3: Cross multiply
    81.40x = 122.16 × 33.34
  4. Step 4: Simplify right side
    81.40x = 4,072.81
  5. Step 5: Solve for x
    x = 4,072.81/81.40
  6. Step 6: Final answer
    x = 50.03

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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.