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Finding the Fourth Proportional to 81.33, 122.04 and 68.64

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Solution

The fourth proportional to 81.33, 122.04 and 68.64 is: 103.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.33 : 122.04 = 68.64 : x
  2. Step 2: Convert to fraction form
    81.33/122.04 = 68.64/x
  3. Step 3: Cross multiply
    81.33x = 122.04 × 68.64
  4. Step 4: Simplify right side
    81.33x = 8,376.83
  5. Step 5: Solve for x
    x = 8,376.83/81.33
  6. Step 6: Final answer
    x = 103.00

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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.