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Finding the Fourth Proportional to 110.81, 165.99 and 81.98

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Solution

The fourth proportional to 110.81, 165.99 and 81.98 is: 122.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    110.81 : 165.99 = 81.98 : x
  2. Step 2: Convert to fraction form
    110.81/165.99 = 81.98/x
  3. Step 3: Cross multiply
    110.81x = 165.99 × 81.98
  4. Step 4: Simplify right side
    110.81x = 13,607.86
  5. Step 5: Solve for x
    x = 13,607.86/110.81
  6. Step 6: Final answer
    x = 122.80

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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.